Lewis Short
aemŭlātor (noun M) : id.
* A zealous imitator, emulator (in a good sense), ζηλωτής: ejus (sc. Catonis), * Cic. Att. 2, 1 fin.: animus aemulator Dei,Sen. Ep. 124 fin.: virtutum aemulator fuit,Just. 6, 3: aemulatores sunt legis,Vulg. Act. 21, 20; 1 Cor. 14, 12.—Eccl., of God as jealous of his honor: Deus est aemulator, (the Lord) is a jealous God, Vulg. Exod. 34, 14.
Charlton T. Lewis, Charles Short, A Latin Dictionary