The Collaborative International Dictionary
Kittening
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.
Wiktionary
kittening
n. The giving birth of kitten