having or exerting great power or force.
physically strong, as a person: a large, powerful athlete.
producing great physical effects, as a machine or a blow.
potent; efficacious: a powerful drug.
having great effectiveness, as a speech, speaker, description, reason, etc.
having great power, authority, or influence; mighty: a powerful nation.
Chiefly South Midland and Southern U.S. great in number or amount: a powerful lot of money.

1350–1400; Middle English powarfull. See power, -ful

powerfully, adverb
powerfulness, noun
overpowerful, adjective
overpowerfully, adverb
overpowerfulness, noun
quasi-powerful, adjective
quasi-powerfully, adverb
superpowerful, adjective
ultrapowerful, adjective
unpowerful, adjective

1. forceful, strong. Powerful, mighty, potent suggest great force or strength. Powerful suggests capability of exerting great force or overcoming strong resistance: a powerful machine like a bulldozer. Mighty now chiefly rhetorical, implies uncommon or overwhelming strength of power: a mighty army. Potent implies great natural or inherent power: a potent influence. 5. influential, convincing, forcible, cogent, effective.

1. weak.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
powerful (ˈpaʊəfʊl)
1.  having great power, force, potency, or effect
2.  extremely effective or efficient in action: a powerful drug; a powerful lens
3.  dialect large or great: a powerful amount of trouble
4.  dialect extremely; very: he ran powerful fast

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

PowerFuL definition

A language combining functional programming and logic programming, using "angelic Powerdomains".

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
These entrepreneurs often operate outside not only the powerful
  state-controlled companies, but outside the country's laws.
Yet teens gravitate toward peers for another, more powerful reason: to invest
  in the future rather than the past.
Belief is powerful medicine, even if the treatment itself is a sham.
Forget the trade unions: the government has made a much more powerful enemy.
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