1) A fatted animal for slaughter (2 Sam. 6:13; Isa. 11:6; Ezek. 39:18. Comp. Matt. 22:4, where the word used in the original, sitistos, means literally "corn-fed;" i.e., installed, fat).
2) Ps. 66:15 (Heb. meah, meaning "marrowy," "fat," a species of sheep).
3) 1 Sam. 15:9 (Heb. mishneh, meaning "the second," and hence probably "cattle of a second quality," or lambs of the second birth, i.e., autmnal lambs, and therfore of less value).
Easton's Bible Dictionary. M.G. Easton. 1897.