Abbott-Smith Manual Greek Lexicon
ἀρχαῖος (G744)
11 ἀρχαῖος , -αία, -αῖον ( ἀρχή ), [in LXX chiefly for קֶדֶם ;] original , ancient : Mt 5:21 , 33 , Lk 9:8 , 19 , Ac 15:7 , 21 21:16 , II Co 5:17 , II Pe 2:5 , Re 12:9 20:2 .† SYN. : παλαιός , old , without the reference to beginning and origin contained in ἀ. The distinction is observed in π. (MM, s.v.). ἀ. is the antithesis to καινός : παλ. to νέος (v. Westc., He. , 223; Cremer, 116).
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain