A primary particle; properly, at the "same" time, but freely used as a preposition or adverb denoting close association -- also, and, together, with(-al).
1. adverb, at the same time, at once, together: Acts 24:26; Acts 27:40; Colossians 4:3; 1 Timothy 5:13; Philemon 1:22; all to a man, every one, Romans 3:12.
2. preposition (Winers Grammar, 470 (439)), together with, with the dative: Matthew 13:29. ἅμα πρωι< early in the morning: Matthew 20:1 (in Greek writings ἅμα τῷ ἡλίῳ, ἅμα τῇ ἡμέρα). In 1 Thessalonians 4:17 and 1 Thessalonians 5:10, where ἅμα is followed by σύν, ἅμα is an adverb (at the same time) and must be joined to the verb.