An idée fixe, an obsession.

A statutory city in Clear Creek County, Colorado, United States.

Feelings, thoughts, contemplation of, a preoccupation with or a general desire for one's own suicide, or the idea of ceasing to exist.

plural of ideal triangle

plural of identification map

plural of identity parade

(mathematics) An analog of the formula det(AB) = det(A) det(B), for certain matrices with noncommuting entries, related to the representation theory of the Lie algebra glₙ. It can be used to relate an invariant ƒ to the invariant Ωƒ, where Ω is Cayley's Ω process.

A number of mountains in various places. / A city, the county seat of Montgomery County, Arkansas, United States. / A neighbourhood in a historic district in Davenport, Iowa, United States.

(psychology) The age category such as "child", "young adult", "old person", etc. that is part of a person's self-identity.