WordReference Random House Learner's Dictionary of American English © 2017
help•ful /ˈhɛlpfəl/USA pronunciation   adj. 
  1. giving aid or assistance:helpful comments; a helpful person.
help•ful•ly, adv. 
help•ful•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2017
help•ful  (helpfəl),USA pronunciation adj. 
  1. giving or rendering aid or assistance;
    of service:Your comments were very helpful.
helpful•ly, adv. 
helpful•ness, n. 
  • 1300–50; Middle English; see help, -ful
    useful, convenient;
    beneficial, advantageous.
    useless, inconvenient.

Collins Concise English Dictionary © HarperCollins Publishers::

helpful /ˈhɛlpfʊl/ adj
  1. serving a useful function; giving help

ˈhelpfully adv ˈhelpfulness n

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