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Webster 1913 Edition

Noun.

The act of one who, or that which, twitters.

A slight nervous excitement or agitation, such as is caused by desire, expectation, or suspense.

A widow, who had a

twittering

towards a second husband, took a gossiping companion to manage the job.

L’Estrange.

ppr.

Uttering a succession of small interrupted sounds, as in a half suppressed laugh, or as a swallow.

twittering

twittering ‎(plural twitterings)

The act of producing chirping sounds, or twitters.
- 1959, Boys' Life (volume 49, number 5, May 1959, page 56)
  Once there, he blushingly went through the procedure, having to fold and refold the flag about three times, to the twitterings and gigglings of twelve little girls.