(algebra) An integral domain in which every ideal is a principal ideal.

(algebra) A subring which is both a left ideal and a right ideal. Commonly referred to simply as an ideal, but referred to as two-sided ideal for emphasis.

(Britain, idiomatic) Utterly lazy.

plural of identity crisis

prediction market

Nonstandard spelling of beau idéal.

(rare) gender identity disorder

Alternative form of reidentification

Alternative spelling of bone-idle

(computing) The (sometimes optional) part of a COBOL program that identifies the name of the program (and optionally of its programmer)