Mawson, C.O.S., ed. (18701938). Rogets International Thesaurus. 1922.
Class V. Words Releasing to the Voluntary Powers
Division (I) Individual Volition
Section I. Volition in General
1. Acts of Volition
612. Impulse.
NOUN:
IMPULSE, sudden thought; impromptu, improvisation; inspiration, flash, spurt.
IMPROVISOR, extemporizer, improvvisatore or improvisatore [It.]; creature of impulse.
VERB:
flash on the mind.
IMPROVISE, extemporize; say what comes uppermost, say what comes first into ones head; act on the spur of the moment, rise to the occasion; spurt.