spec. A person who engages in warlike adventures, esp. for financial gain, without any attachment to a particular party; a soldier of fortune, a…

One voluntarily, and usually without pay, serving as a soldier in a campaign, battle, etc.; = volunteer, n. 1. Obsolete.

A military officer left without a command owing to reorganization but retaining his rank and seniority, and receiving full or half pay. Also: a…

Military. One who voluntarily offers or enrols himself for military service, in contrast to those who are under obligation to do so, or who form…

= reformado, n. Frequently attributive. historical in later use.