/ Dictionary / Index K knapsack problem: Meaning and Definition of Find definitions for: knap'sack prob"lem Pronunciation: [key] — Math. Math. the problem of determining which numbers from a given collection of numbers have been added together to yield a specific sum: used in cryptography to encipher (and sometimes decipher) messages. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. knapsack knapweed Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language