simple past tense and past participle of improv

plural of improval

(historical) A late Victorian and Edwardian-era woman’s undergarment providing padding for the breasts.

plural of bust improver

any substance added to flour in order to improve some aspect of its performance

The following of a disciplined programme to improve one's physical health, mental health or character. / The bettering of one's status.

plural of improving agent

(game theory, economics) A change in the allocation of a resource to a set of individuals that is an improvement for at least one and no worse for any other.

plural of Pareto improvement

plural of Pareto-improvement