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Webster 1913 Edition

(#; 277)

adv.

In an abstract state or manner; separately; absolutely; by itself;

as, matter

abstractly

considered

adv.

separately; absolutely; in a state or manner unconnected with any thing else; as, matter abstractly considered.

abstractly ‎(comparative more abstractly, superlative most abstractly)

In an abstract state or manner; separately; absolutely, as matter abstractly considered. [First attested around 1350 to 1470.]^[1]

in an abstract manner

↑ Lesley Brown (editor), The Shorter Oxford English Dictionary, 5th edition (Oxford University Press, 2003 [1933], ISBN 978-0-19-860575-7), page 10