Associations to the word «Subsonic»

Wiktionary

SUBSONIC, adjective. (of a sound) having a frequency too low to be audible
SUBSONIC, adjective. (of a speed) less than the speed of sound (in the same medium, and at the same temperature and pressure)
SUBSONIC, adjective. (fluid mechanics) (of a flow) with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources).

Dictionary definition

SUBSONIC, adjective. (of speed) less than that of sound in a designated medium; "aircraft flying at subsonic speeds".

Wise words

Words are always getting conventionalized to some secondary meaning. It is one of the works of poetry to take the truants in custody and bring them back to their right senses.
William Butler Yeats