Breadcrumb Home > Dictionary > Index K keying sequence: Meaning and Definition of Find definitions for: key'ing se"quence Pronunciation: [key] — Cryptography. Cryptography. a sequence made up of letters or numbers that can encode or decode a polyalphabetic substitution cipher one letter at a time. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. keyhole saw Key Largo TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: preternatural Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language