get to first base. first base(def 2).
    off base,
    1. Baseball.not touching a base: The pitcher caught him off base and, after a quick throw, he was put out by the second baseman.
    2. Informal.badly mistaken: The police were way off base when they tried to accuse her of the theft.
    on base, Baseball. having reached a base or bases: Two men are on base.
    touch base with, to make contact with: They've touched base with every political group on campus.

Origin of base

1275–1325; Middle English (noun) < Middle French < Latin basis basis; cf. prisoner's base
Related formsun·based, adjectivewell-based, adjective

Synonym study

1. Base, basis, foundation refer to anything upon which a structure is built and upon which it rests. Base usually refers to a literal supporting structure: the base of a statue. Basis more often refers to a figurative support: the basis of a report. Foundation implies a solid, secure understructure: the foundation of a skyscraper or a rumor.



adjective, bas·er, bas·est.

morally low; without estimable personal qualities; dishonorable; meanspirited; selfish; cowardly.
of little or no value; worthless: hastily composed of base materials.
debased or counterfeit: an attempt to eliminate the base coinage.
characteristic of or befitting an inferior person or thing.
of illegitimate birth.
not classical or refined: base language.
Old English Law. held by tenure less than freehold in return for a service viewed as somewhat demeaning to the tenant.
  1. of humble origin or station.
  2. of small height.
  3. low in place, position, or degree: base servitude.
Obsolete. deep or grave in sound; bass: the base tones of a piano.


Music Obsolete. bass1(defs 3, 4).

Origin of base

1350–1400; Middle English bas < Old French < Late Latin bassus low, short, perhaps of Oscan orig.
Related formsbase·ly, adverbbase·ness, noun

Synonyms for base

1. despicable, contemptible. See mean2. 2. poor, inferior, cheap, tawdry. 3. fake, spurious. 4. servile, ignoble, abject, slavish, menial.


[trahy-ang-gyuh-ley-shuh n]

noun Surveying, Navigation.

a technique for establishing the distance between any two points, or the relative position of two or more points, by using such points as vertices of a triangle or series of triangles, such that each triangle has a side of known or measurable length (base or base line) that permits the size of the angles of the triangle and the length of its other two sides to be established by observations taken either upon or from the two ends of the base line.
the triangles thus formed and measured.

Origin of triangulation

1810–20; < Medieval Latin triangulātiōn- (stem of triangulātiō) the making of triangles. See triangulate, -ion Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for base

Contemporary Examples of base

Historical Examples of base

British Dictionary definitions for base




the bottom or supporting part of anything
the fundamental or underlying principle or part, as of an idea, system, or organization; basis
  1. a centre of operations, organization, or supplythe climbers made a base at 8000 feet
  2. (as modifier)base camp
a centre from which military activities are coordinated
anything from which a process, as of measurement, action, or thought, is or may be begun; starting pointthe new discovery became the base for further research
the main ingredient of a mixtureto use rice as a base in cookery
a chemical compound that combines with an acid to form a salt and water. A solution of a base in water turns litmus paper blue, produces hydroxyl ions, and has a pH greater than 7. Bases are metal oxides or hydroxides or aminesSee also Lewis base
biochem any of the nitrogen-containing constituents of nucleic acids: adenine, thymine (in DNA), uracil (in RNA), guanine, or cytosine
a medium such as oil or water in which the pigment is dispersed in paints, inks, etc; vehicle
the inorganic material on which the dye is absorbed in lake pigments; carrier
  1. the part of an organ nearest to its point of attachment
  2. the point of attachment of an organ or part
the bottommost layer or part of anything
  1. the lowest division of a building or structure
  2. the lower part of a column or pier
another word for baseline (def. 2)
the lower side or face of a geometric construction
  1. the number of distinct single-digit numbers in a counting system, and so the number represented as 10 in a place-value systemthe binary system has two digits, 0 and 1, and 10 to base two represents 2 See place-value
  2. (of a logarithm or exponential) the number whose powers are expressedsince 1000 = 10³, the logarithm of 1000 to base 10 is 3
  3. (of a mathematical structure) a substructure from which the given system can be generated
  4. the initial instance from which a generalization is proven by mathematical induction
Also called: base clause logic maths the initial element of a recursive definition, that defines the first element of the infinite sequence generated thereby
  1. a root or stem
  2. See base component
electronics the region in a transistor between the emitter and collector
photog the glass, paper, or cellulose-ester film that supports the sensitized emulsion with which it is coated
heraldry the lower part of the shield
jewellery the quality factor used in pricing natural pearls
a starting or finishing point in any of various games
baseball any of the four corners of the diamond, which runners have to reach in order to score
the main source of a certain commodity or elementa customer base; their fan base
get to first base US and Canadian informal to accomplish the first stage in a project or a series of objectives
off base US and Canadian informal wrong or badly mistaken
touch base to make contact


(tr foll by on or upon) to use as a basis (for); found (on)your criticisms are based on ignorance
(often foll by at or in) to station, post, or place (a person or oneself)

Word Origin for base

C14: from Old French, from Latin basis pedestal; see basis




devoid of honour or morality; ignoble; contemptible
of inferior quality or value
debased; alloyed; counterfeitbase currency
English history
  1. (of land tenure) held by villein or other ignoble service
  2. holding land by villein or other ignoble service
archaic born of humble parents; plebeian
archaic illegitimate

adjective, noun

music an obsolete spelling of bass 1
Derived Formsbasely, adverbbaseness, noun

Word Origin for base

C14: from Old French bas, from Late Latin bassus of low height, perhaps from Greek bassōn deeper



a method of surveying in which an area is divided into triangles, one side (the base line) and all angles of which are measured and the lengths of the other lines calculated trigonometrically
the network of triangles so formed
the fixing of an unknown point, as in navigation, by making it one vertex of a triangle, the other two being known
chess a key manoeuvre in the endgame in which the king moves thrice in a triangular path to leave the opposing king with the move and at a disadvantage
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for base

"bottom, foundation, pedestal," early 14c., from Old French bas "depth" (12c.), from Latin basis "foundation," from Greek basis "step, pedestal," from bainein "to step" (see come). The military sense is from 1860. The chemical sense (1810) was introduced in French 1754 by French chemist Guillaume-François Rouelle (1703-1770). Sporting sense of "starting point" ia from 1690s, also "destination of a runner" (1812). As a "safe" spot in a tag-like game, suggested from mid-15c. (as the name of the game later called prisoner's base).


late 14c., "low, of little height," from Old French bas "low, lowly, mean," from Late Latin bassus "thick, stumpy, low" (used only as a cognomen in classical Latin, humilis being there the usual word for "low in stature or position"), possibly from Oscan, or Celtic, or related to Greek basson, comparative of bathys "deep." Figurative sense of "low in the moral scale" is first attested 1530s in English, earlier "servile" (1520s). Base metals (c.1600) were worthless in contrast to noble or precious metals.


"to place on a foundation," 1841, from base (n.). Related: Based; basing.



1818, from Medieval Latin triangulationem (mid-12c., nominative triangulatio), noun of action from Latin *triangulare, from triangulum (see triangle).

Online Etymology Dictionary, © 2010 Douglas Harper

base in Medicine




The part of an organ nearest its point of attachment.
A fundamental ingredient; a chief constituent of a mixture.
Any of a large class of compounds, including the hydroxides and oxides of metals, having a bitter taste, a slippery solution, the capacity to turn litmus blue, and to react with acids to form salts.
A molecular or ionic substance capable of combining with a proton to form a new substance.Brønsted base
A nitrogen-containing organic compound that combines in such a manner.
A substance that provides a pair of electrons for a covalent bond with an acid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

base in Science



  1. Any of a class of compounds that form hydroxyl ions (OH) when dissolved in water, and whose aqueous solutions react with acids to form salts. Bases turn red litmus paper blue and have a pH greater than 7. Their aqueous solutions have a bitter taste. Compare acid.
  2. See nitrogen base.
  1. The side or face of a geometric figure to which an altitude is or is thought to be drawn. The base can be, but is not always, the bottom part of the figure.
  2. The number that is raised to various powers to generate the principal counting units of a number system. The base of the decimal system, for example, is 10.
  3. The number that is raised to a particular power in a given mathematical expression. In the expression an, a is the base.



A method of determining the relative positions of points in space by measuring the distances, and sometimes angles, between those points and other reference points whose positions are known. Triangulation often involves the use of trigonometry. It is commonly used in the navigation of aircraft and boats, and is the method used in the Global Positioning System , in which the reference points are satellites.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

base in Culture


Any of a number of bitter-tasting, caustic materials. Technically, a material that produces negative ions in solution. A base is the opposite of an acid and has a pH of 7 to 14. A given amount of a base added to the same amount of an acid neutralizes the acid; water and a salt are produced. Alkalis are bases; ammonia is a common base.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with base


see get to first base; off base; touch base.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.