Easton's Bible Dictionary (1897)
Second, a Christian of Thessalonica who accompanied Paul into Asia (Acts 20:4).
Smith's Bible Dictionary (1863)
(fortunate), a Thessalonian Christian. (Acts 20:4) (A.D. 55.) Seer, [Prophet]
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
SECUN'DUS (second, or fortunate), a Christian of Thessalonica. Acts 20:4.
Hitchcock's Bible Names (1869)
second