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Webster 1913 Edition

adv.

In a polite or courtly manner; like a gallant or wooer.

adv.

In a gallant manner.

adv.

Gaily; splendidly.

Bravely; nobly; heroically; generously; as, to fight gallantly; to defend a place gallantly.

gallantly ‎(comparative more gallantly, superlative most gallantly)