From The Collaborative International Dictionary of English v.0.48 [gcide]:
Kitten \Kit"ten\, v. t. & i. [imp. & p. p. Kittened; p. pr. &
vb. n. Kittening.]
To bring forth young, as a cat; to bring forth, as kittens.
--Shak. --H. Spencer.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Kitten \Kit"ten\ (k[i^]t"t'n), n. [OE. kiton, a dim. of cat; cf.
G. kitze a young cat, also a female cat, and F. chaton, dim.
of chat cat, also E. kitling. See Cat.]
A young cat.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
kitten
n 1: young domestic cat [syn: kitten, kitty]
v 1: have kittens; "our cat kittened again this year"