Noun

(loci)

A place or locality, especially a centre of activity or the scene of a crime.

The cafeteria was the locus of activity.

(mathematics) The set of all points whose coordinates satisfy a given equation or condition.

A circle is the locus of points from which the distance to the center is a given value, the radius.

(genetics) A fixed position on a chromosome that may be occupied by one or more genes.

Noun

(en noun)

The way in which something is positioned vis-à-vis its surroundings.

* 1908 , (Kenneth Grahame), (The Wind in the Willows) :

...he being naturally an underground animal by birth and breeding, the situation of Badger's house exactly suited him and made him feel at home; while the Rat, who slept every night in a bedroom the windows of which opened on a breezy river, naturally felt the atmosphere still and oppressive.

The place in which something is situated; a location.

* 1833 , Thomas Hibbert and Robert Buist, The American Flower Garden Directory , page 142:

[Hibíscus] speciòsus is the most splendid, and deserves a situation in every garden.

Position or status with regard to conditions and circumstances.

The combination of circumstances at a given moment; a state of affairs.

*

, title=(The Celebrity), chapter=5 , passage=Then we relapsed into a discomfited silence, and wished we were anywhere else. But Miss Thorn relieved the situation by laughing aloud, and with such a hearty enjoyment that instead of getting angry and more mortified we began to laugh ourselves, and instantly felt better.}}

(UK, dated) A position of employment; a post.

* 1913 , , (Sons and Lovers) , Penguin 2006, page 78:

When he was nineteen, he suddenly left the 'Co-op' office, and got a situation in Nottingham.

* 1946 , Vaughn Horton, Denver Darling, Milt Gabler, :

You take a morning paper from the top of the stack

And read the situations from the front to the back

The only job that's open need a man with a knack

So put it right back in the rack Jack.

A difficult or unpleasant set of circumstances; a problem.

Boss, we've got a situation here...