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[loh-kuh s] /ˈloʊ kəs/
noun, plural loci
[loh-sahy, -kee, -kahy] /ˈloʊ saɪ, -ki, -kaɪ/ (Show IPA),
[loh-kuh] /ˈloʊ kə/ (Show IPA)
a place; locality.
a center or source, as of activities or power:
locus of control.
Mathematics. the set of all points, lines, or surfaces that satisfy a given requirement.
Genetics. the chromosomal position of a gene as determined by its linear order relative to the other genes on that chromosome.
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] /ˈloʊ kʊs ˈklɑs sɪˌkʊs; English ˈloʊ kəs ˈklæs ɪ kəs/
noun, plural loci classici
[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/ (Show IPA).
classical source: a passage commonly cited to illustrate or explain a subject or word.

locus in quo

[loh-koo s in kwoh; English loh-kuh s in kwoh] /ˈloʊ kʊs ɪn ˈkwoʊ; English ˈloʊ kəs ɪn ˈkwoʊ/
noun, Latin.
the place in which; the very place; the scene of the event.

locus sigilli

[loh-koo s see-geel-lee; English loh-kuh s si-jil-ahy] /ˈloʊ kʊs siˈgil li; English ˈloʊ kəs sɪˈdʒɪl aɪ/
noun, plural loci sigilli
[loh-kee see-geel-lee; English loh-sahy si-jil-ahy, loh-kahy] /ˈloʊ ki siˈgil li; English ˈloʊ saɪ sɪˈdʒɪl aɪ, ˈloʊ kaɪ/ (Show IPA).
See L.S (def 3). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for locus
  • My own university was the locus of one set of these scandals.
  • The locus of the human mystery is perception of this world.
  • It also shifted the locus of decision-making from locally based citizens to distant corporate boards.
  • Because the locus of world economic power is shifting.
  • The locus of campaigning may not be candidate-centered or party-centered or even ideologically centered.
  • Anxiety is more of a cognitive problem, with a locus in the prefrontal cortex-a region of the brain that helps us plan ahead.
  • The concept was to entice people to a more sustainable living locus of activities without a high price for the use of cars.
  • It is a matter of intrinsic vs extrinsic motivation, an internal vs external locus of control.
  • But, the relationship between grandparent and grandchild is not deterministic at any given locus.
  • So cystic fibrosis is due to a mutation at one gene, and the disease expresses recessively at that locus.
British Dictionary definitions for locus


noun (pl) loci (ˈləʊsaɪ)
(in many legal phrases) a place or area, esp the place where something occurred
(maths) a set of points whose location satisfies or is determined by one or more specified conditions: the locus of points equidistant from a given point is a circle
(genetics) the position of a particular gene on a chromosome
Word Origin
C18: Latin

locus classicus

noun (pl) loci classici (ˈklæsɪˌsaɪ)
an authoritative and often quoted passage from a standard work
Word Origin
Latin: classical place

locus sigilli

noun (pl) loci sigilli
the place to which the seal is affixed on legal documents, etc
Word Origin
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
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Word Origin and History for locus

(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.

Online Etymology Dictionary, © 2010 Douglas Harper
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locus in Medicine

locus lo·cus (lō'kəs)
n. pl. lo·ci (-sī', -kē, -kī')

  1. A place; site.

  2. The position that a given gene occupies on a chromosome.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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locus in Science
Plural loci (lō'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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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locus in Culture

locus definition

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.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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locus in Technology

A distributed system project supporting transparent access to data through a network-wide file system.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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