ETYMOLOGY
from Latin acclamat-, past participial stem of acclamare (to praise publicly and enthusiastically, to applaud)
EXAMPLE
“… that but for shame hee had drawne the Roman legions out of Britain, and so timorous of weapons, that Tiridates riueted his sword to the sheath thereof, for his assurance (because hee would not vnknightly yeeld to goe vngirt, though it were vpon condition, to receiue the diadem of Armenia) was now notwithstanding, with as shrill, and ioyous showts acclamated Imperator, as if in person hee had conquered Armenia by the sword….”
From: Nero Caesar, or, Monarchie Depraved
By Edmund Bolton, 1624
Lexicophilia 