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Answer for the clue "The quickness of action or occurrence ", 17 letters:
instantaneousness

Word definitions for instantaneousness in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Instantaneous \In`stan*ta"ne*ous\, a. [Cf. F. instantan['e].] Done or occurring in an instant, or without any perceptible duration of time; as, the passage of electricity appears to be instantaneous. His reason saw With instantaneous view, the truth ...

Wiktionary Word definitions in Wiktionary
n. condition of being instantaneous

WordNet Word definitions in WordNet
n. the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication" [syn: immediacy , immediateness , instancy ]