/ Dictionary / Index A AISI: Meaning and Definition of Find definitions for: AISI Pronunciation: [key] American Iron and Steel Institute. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Aisha AISI steel Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language