/ Dictionary / Index C cotter slot: Meaning and Definition of Find definitions for: cot'ter slot" Pronunciation: [key] — Mach. Mach. a slot cut into the end of a rod for the reception of another rod or part to be attached by a cotter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cotter pin Cottian Alps Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language