/ Dictionary / Index A alphanumeric: Meaning and Definition of Find definitions for: al•pha•nu•mer•ic Pronunciation: (al"fu-n-mer'ik, -ny-), [key] — adj. Computers. (of a set of characters) including letters, numbers, and, often, special characters, as punctuation marks: alphanumeric code. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: alphanumeric (Thesaurus) alpha-naphthylthiourea alpha particle Related Content Daily Word Quiz: mongrel Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language