Ac`u*a"tion (&?;), n. Act of sharpening. [R.]

Ac`u*i"tion (&?;), n. [L. acutus, as if acuitus, p. p. of acuere to sharpen.] The act of sharpening. [Obs.]

A*cu"i*ty (&?;), n. [LL. acuitas: cf. F. acuité.] Sharpness or acuteness, as of a needle, wit, etc.

A*cu"le*ate (&?;), a. [L. aculeatus, fr. aculeus, dim. of acus needle.] 1. (Zoöl.) Having a sting; covered with prickles; sharp like a prickle.