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Webster 1913 Edition

adv.

With effect; effectively.

adv.

With effect; effectively.

efficiently ‎(comparative more efficiently, superlative most efficiently)

In an efficient manner.
- 2011 October 1, Phil Dawkes, “Sunderland 2 - 2 West Brom”, in BBC Sport:
  The second half was a less open affair, in which West Brom grew increasingly and efficiently conservative.

in an efficient manner