Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: beneficium; BENEFICE

beneficial

 adjective
     
ben‧e‧fi‧cial
having a good effect [≠ detrimental]:
a drug that has a beneficial effect on the immune system
beneficial to/for
Cycling is highly beneficial to health and the environment.
an arrangement that is mutually beneficial (=it has advantages for everyone who is involved)
—beneficially adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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