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Webster 1913 Edition

adv.

In a useful manner.

adv.

In such a manner as to produce or advance some end; as instruments or time usefully employed.

usefully ‎(comparative more usefully, superlative most usefully)

In a useful manner; in a way that achieves something
I would rather have it said, "He lived usefully," than, "He died rich."

in a useful manner