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Merriam-Webster’s Collegiate Dictionary, Tenth Edition is unavailable, but you can change that!

Merriam-Webster’s Collegiate Dictionary is based on the world’s largest collection of information about the way the English language is written and spoken in our time—a citation file of over 14½ million examples of English words drawn from actual use, more than 1 million collected since the last edition. The volume also includes: well-drafted Definitions and Pronunciations, Extensive...

ful adjective suffix sometimes -ful•ler sometimes -ful•lest [Middle English, from Old English, from full, adj] 1 : full of 〈prideful〉 2 : characterized by 〈peaceful〉 3 : having the qualities of 〈masterful〉 4 : tending, given, or liable to 〈helpful〉 2-ful noun suffix : number or quantity that fills or would fill 〈roomful〉