
Latin, meaning: keeness, edge, sharpness, battle-line, battlefield.
Found on
http://archives.nd.edu/aaa.htm

Battle line.
Found on
http://www.encyclo.co.uk/local/20764

The line of battle.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

acies 1. Battle array, the front of an army line of battle; from Roman antiquity. 2. The keen attention or aim, of the eye, ear, etc. when fully directed towards any object.
Found on
http://www.wordinfo.info/words/index/info/view_unit/17/

keenness, edge, sharpness, battle-line, battlefield.
Found on
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
No exact match found.