[ sahyn-in ]
/ ˈsaɪnˌɪn /
an act, an instance, or a time of signing in.
The 13th Zodiac Sign: OphiuchusWhether or not you believe that the sun, moon, stars, and planets have any bearing on your personality, you probably know what your astrological sign is. But have you heard of Ophiuchus? Some astrologers consider it to be the 13th astrological sign.
Origin of sign-in
First recorded in 1945–50; noun use of verb phrase sign in
Definition for sign in (2 of 2)
[ sahyn ]
/ saɪn /
a token; indication.
any object, action, event, pattern, etc., that conveys a meaning.
a conventional or arbitrary mark, figure, or symbol used as an abbreviation for the word or words it represents.
a motion or gesture used to express or convey an idea, command, decision, etc.: Her nod was a sign that it was time to leave.
a notice, bearing a name, direction, warning, or advertisement, that is displayed or posted for public view: a traffic sign; a store sign.
a trace; vestige: There wasn't a sign of them.
an arbitrary or conventional symbol used in musical notation to indicate tonality, tempo, etc.
Medicine/Medical. the objective indications of a disease.
any meaningful gestural unit belonging to a sign language.
an omen; portent: a sign of approaching decadence.
Usually signs. traces, as footprints, of a wild animal.
- a plus sign or minus sign used as a symbol for indicating addition or subtraction.
- a plus sign or minus sign used as a symbol for indicating the positive or negative value of a quantity, as an integer.
- multiplication sign.
- division sign.
- a symbol, as or !, used to indicate a radical or factorial operation.
verb (used with object)
verb (used without object)
sign away/over, to assign or dispose of by affixing one's signature to a document: She signed over her fortune to the church.
sign in, to record or authorize one's arrival (or departure) by signing a register.Also sign out.
- to withdraw, as from some responsibility or connection.
- to cease radio or television broadcasting, especially at the end of the day.
- Informal. to become silent: He had exhausted conversation topics and signed off.
- to indicate one's approval explicitly if not formally: The president is expected to sign off on the new agreement.
- to employ; hire.
- to bind oneself to work, as by signing a contract: He signed on as a pitcher with a major-league team.
- to start radio or television broadcasting, especially at the beginning of the day.
- Computers. log1(def 17a).
sign up, to enlist, as in an organization or group; to register or subscribe: to sign up for the navy; to sign up for class.
Origin of sign
1175–1225; (noun) Middle English signe < Old French < Latin signum mark, sign, ensign, signal, image; (v.) Middle English signen to mark with a sign, especially the sign of the cross < Old French signer < Latin signāre to mark with a sign, inscribe, affix a seal to, derivative of signum
SYNONYMS FOR sign
1, 4 signal.
10 indication, hint, augury. Sign, omen, portent name that which gives evidence of a future event. Sign is a general word for whatever gives evidence of an event—past, present, or future: Dark clouds are a sign of rain or snow. An omen is an augury or warning of things to come; it is used only of the future, in general, as good or bad: birds of evil omen. Portent, limited, like omen, to prophecy of the future, may be used of a specific event, usually a misfortune: portents of war.
Related formssign·less, adjectivesign·like, adjectivepost·sign, verb (used with object)un·signed, adjective
Can be confusedsign sing (see synonym study at the current entry)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for sign in (1 of 2)
to sign or cause to sign a register, as at a hotel, club, etc
to make or become a member, as of a club
British Dictionary definitions for sign in (2 of 2)
/ (saɪn) /
something that indicates or acts as a token of a fact, condition, etc, that is not immediately or outwardly observable
an action or gesture intended to convey information, a command, etc
- a board, placard, etc, displayed in public and inscribed with words or designs intended to inform, warn, etc
- (as modifier)a sign painter
an arbitrary or conventional mark or device that stands for a word, phrase, etc
- any symbol indicating an operationa plus sign; an implication sign
- the positivity or negativity of a number, quantity, or expressionsubtraction from zero changes the sign of an expression
an indication or vestigethe house showed no signs of being occupied
a portentous or significant event
an indication, such as a scent or spoor, of the presence of an animal
med any objective evidence of the presence of a disease or disorderCompare symptom (def. 1)
astrology Compare sign of the zodiac
to write (one's name) as a signature to (a document, etc) in attestation, confirmation, ratification, etc
(intr often foll by to) to make a sign; signal
to engage or be engaged by written agreement, as a player for a team, etc
(tr) to outline in gestures a sign over, esp the sign of the cross
(tr) to indicate by or as if by a sign; betoken
(intr) to use sign language
Derived Formssignable, adjective
Word Origin for sign
C13: from Old French signe, from Latin signum a sign
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
Medicine definitions for sign in
[ sīn ]
An objective finding, usually detected on physical examination, from a laboratory test, or on an x-ray, that indicates the presence of abnormality or disease.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for sign in
[ sīn ]
A body manifestation, usually detected on physical examination or through laboratory tests or xrays, that indicates the presence of abnormality or disease. Compare symptom.
See symbol. See Table at symbol.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Idioms and Phrases with sign in (1 of 2)
Record one's arrival by signing a register, as in He signed in both himself and his wife. [c. 1930] For the antonym, see sign out.
Idioms and Phrases with sign in (2 of 2)
In addition to the idioms beginning with sign
- sign in
- sign off
- sign on
- sign one's own death warrant
- sign on the dotted line
- sign out
- sign over
- sign up
- high sign
- show signs of
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.