TITTER
NOUNS
► TWITTER a fit of laughter; a titter, a giggle → 1700 chiefly Eng. dial. & US
► TWITTERING a laughing, esp. in a somewhat suppressed or restrained manner, the sound of such laughter; tittering, giggling, sniggering → 1654
VERBS
► LAITCH to titter; to be gay; to laugh → 1902 Eng. dial. (Bk.)
► TICHER to titter; to laugh in a suppressed way → 1905 Sc. (Bk.)
► TWITTER to laugh in a somewhat suppressed or restrained way; to titter, to giggle, to snigger → 1654
Lexicophilia 