Additionally,
the word adelphos is used for
(1) male children of the same
parents (Mt 1:2);
(2) male descendants of the same
parents (Acts 7:23);
(3) male children of the same
mother (Gal 1:19);
(4) people of the same
nationality (Acts 3:17);
(5) any man, a neighbor (Lk
10:29);
(6) persons united by a common
interest (Mt 5:47);
(7) persons united by a common
calling (Rev 22:9);
(8) mankind (Mt 25:40);
(9) the disciples (Mt 23:8); and
(10) believers (Mt 23:8).
(From Vine's Expository Dictionary of Biblical Words, Thomas Nelson,
Publisher.)