Definition of "ace" []

• A single spot or pip on a playing card, die, or domino. (noun)
• A playing card, die, or domino having one spot or pip. (noun)
• In racket games: (noun)
• A serve that one's opponent fails to hit. (noun)
• A point scored by such a serve. (noun)
• Any die, domino, or any of four playing cards with one spot (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• A single spot or pip on a playing card, die, etc (noun)
• A winning serve that the opponent fails to reach (noun)
• A hole in one (noun)
• A fighter pilot accredited with destroying several enemy aircraft (noun)
• An expert or highly skilled person (noun)
• Superb; excellent (adjective)
• To serve an ace against (verb)
• To play (a hole) in one stroke (verb)
• To perform extremely well or score very highly in (an examination, etc) (verb)

www.Collinsdictionary.com (c) HarperCollins Publishers Ltd 2016

• "For example, not host vs and ace is short for not host vs and host ace which should not be confused with not (host vs or ace) Expression arguments can be passed to tcpdump as either a single argument or as multiple arguments, whichever is more convenient."
• "The ace is C.C. Sabathia, hands down one of the best pitchers in the league."
• "The Southsiders ace is Jake Peavy, and deservingly so, the guys has IT."