/ Dictionary / Index A ALU: Meaning and Definition of Find definitions for: ALU Pronunciation: [key] — Computers. Computers. arithmetic/logic unit: the part of a central processing unit that performs arithmetic and logical operations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Altus Al-Ubayyid Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language