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locus

[loh-kuh s]
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noun, plural lo·ci [loh-sahy, -kee, -kahy] /ˈloʊ saɪ, -ki, -kaɪ/, lo·ca [loh-kuh] /ˈloʊ kə/.
  1. a place; locality.
  2. a center or source, as of activities or power: locus of control.
  3. Mathematics. the set of all points, lines, or surfaces that satisfy a given requirement.
  4. Genetics. the chromosomal position of a gene as determined by its linear order relative to the other genes on that chromosome.
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Origin of locus

1525–35; < Latin; OL stlocus a place

locus classicus

[loh-koo s klahs-si-koo s; English loh-kuh s klas-i-kuh s]
noun, plural lo·ci clas·si·ci [loh-kee klahs-si-kee; English loh-sahy klas-uh-sahy, loh-kahy klas-i-kahy] /ˈloʊ ki ˈklɑs sɪˌki; English ˈloʊ saɪ ˈklæs əˌsaɪ, ˈloʊ kaɪ ˈklæs ɪˌkaɪ/. Latin.
  1. classical source: a passage commonly cited to illustrate or explain a subject or word.
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locus in quo

[loh-koo s in kwoh; English loh-kuh s in kwoh]
noun Latin.
  1. the place in which; the very place; the scene of the event.
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locus sigilli

[loh-koo s see-geel-lee; English loh-kuh s si-jil-ahy]
noun, plural lo·ci si·gil·li [loh-kee see-geel-lee; English loh-sahy si-jil-ahy, loh-kahy] /ˈloʊ ki siˈgil li; English ˈloʊ saɪ sɪˈdʒɪl aɪ, ˈloʊ kaɪ/. Latin.
  1. See L.S.(def 3).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for locus

locus

noun plural loci (ˈləʊsaɪ)
  1. (in many legal phrases) a place or area, esp the place where something occurred
  2. maths a set of points whose location satisfies or is determined by one or more specified conditionsthe locus of points equidistant from a given point is a circle
  3. genetics the position of a particular gene on a chromosome
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Word Origin

C18: Latin

locus classicus

noun plural loci classici (ˈklæsɪˌsaɪ)
  1. an authoritative and often quoted passage from a standard work
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Word Origin

Latin: classical place

locus sigilli

noun plural loci sigilli
  1. the place to which the seal is affixed on legal documents, etc
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Word Origin

Latin
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 locus

n.

(plural loci), 1715, "locality," from Latin locus "a place, spot, position," from Old Latin stlocus, literally "where something is placed," from PIE root *st(h)el- "to cause to stand, to place." Used by Latin writers for Greek topos. Mathematical sense by 1750.

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Online Etymology Dictionary, © 2010 Douglas Harper

locus in Medicine

locus

(lōkəs)
n. pl. lo•ci (-sī′, -kē, -kī′)
  1. A place; site.
  2. The position that a given gene occupies on a chromosome.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

locus in Science

locus

[lōkəs]
Plural loci (sī′, -kē, -kī′)
  1. The set or configuration of all points whose coordinates satisfy a single equation or one or more algebraic conditions.
  2. The position that a given gene occupies on a chromosome.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

locus in Culture

locus

plur. loci (loh-seye, loh-keye)

In geometry, the set of all points (and only those points) that satisfy certain conditions; these points form a curve or figure. For example, the locus of all points in space one foot from a given point is a sphere having a radius of one foot and having its center at the given point. The locus of all points in a plane one foot from a given point is a circle having a radius of one foot and having its center at the given point.

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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.