Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun instantaneousness

1 sense of instantaneousness

Sense 1
immediacy, immediateness, instantaneousness, instancy -- (the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication")
       => celerity, quickness, rapidity, rapidness, speediness -- (a rate that is rapid)