Definition of vexillation in US English:

vexillation

noun

  • A company of veteran soldiers or of soldiers grouped under one standard.

Origin

Mid 17th century; earliest use found in Thomas Blount (1618–1679), antiquary and lexicographer. From classical Latin vexillātiōn-, vexillātiō detachment from vexillum + -ātiō.

Pronunciation

vexillation

/ˌvɛksɪˈleɪʃn/