begun

Etymology

verb

1. past participle of begin
   ... when he should take the sield, that city was persuaded to complete the regiment they had begun to form, under the command of a Colonel whom the King had recommended to them ; which they did raise to the number of a thousand men. 1807, Edward Hyde (1st earl of Clarendon.), The history of the rebellion and civil wars in England, begun in the year 1641. 3 vols. [each in 2 pt.]., page 717
2. (obsolete or nonstandard) simple past of begin
   When we've been there ten thousand years, Bright shining as the sun, We've no less days to sing God's praise, Than when we first begun. 1790 (see Amazing Grace)