Behaviour which is contrary to social expectations, which is inappropriate or rude.

Of recent origin.

(idiomatic) A return to a former state of success or brilliance.

(linguistics) a unit of language that can only be used as part of a word, not as a word on its own (such as the English suffix -ly).

(idiomatic) To go back to a better, original state.

(mathematics) A form (expression) that does not use limits, implicitly or explicitly. / (mathematics) A differential form whose exterior derivative is zero.

(linguistics) A synonymous but not identical, coexisting form (variation) of a word, such as an accepted alternative spelling.

The basic form of a word used as a dictionary headword.

Any of a set of presuppositions or fundamental ideas which define the thinking of people of a given region, time period etc.

(music) A form of classical music consisting of a single movement divided into three main sections, the exposition, development and recapitulation, sometimes followed by a coda.