Abbott-Smith Manual Greek Lexicon
φιλαδελφία (G5360)
6 φιλαδελφία , -ας, ἡ ( φιλάδελφος ), [in LXX: IV Mac 13:23 , 26 14:1 * ;] the love of brothers, brotherly love : of Christians' mutual love as brethren (v.s. ἀδελφός ), Ro 12:10 , I Th 4:9 , He 13:1 , I Pe 1:22 , II Pe 1:7 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain