adverbdialect, rareScottish, British
On equal terms, on an equal footing (with a person); (also) in step, in line. Frequently in "to be even hands with". Compare "on (also at, of) even hand (also hands)".
Late 15th century; earliest use found in Malory's Morte Darthur. Originally from even + hand, after on (also at, of) even hand (also hands).