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

Word definitions for instantaneousness in dictionaries

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 ]

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