Definition of "mery"

A Yonge gentylman of the age of .xx. yere some whate dysposyd to myrth and game on a tyme talkyd with a gentylwoman which was ryght wyfe and also mery.

1526, John Rastell, edited by Hermann Oesterley, A Hundred Mery Talys: From the Only Perfect Copy Known (published 1866), page 57

As plesaunt to the ere as the blacke sanctus Of a sad sorte vpon a mery pyn.

1533, R. Saltwood, A comparyson bytwene. iiij. byrdes, the larke, the nyghtyngale, ye thrusshe [and] the cuko, for theyr syngynge who shuld be chauntoure of the quere

At Christmas be mery, and thanke god of alll And feast thy pore neighbours, the great with the small.

1581, William Sandys, Christmastide: Its History, Festivities, and Carols (published 2020)

There was a mery Monke in Cambridge in the college that I was in, and it chanced a great company of us to be together, intending to make good cheare, to be mery (as scholers wd by mery when they are disposed:)

1596, Hugh Latimer, Frutefull Sermons, page 52