Brother

Smith’s Bible Dictionary · William Smith, F. N. Peloubet, M. A. Peloubet

The Hebrew word is used in various senses in the Old Testament, as,

Any kinsman, and not a mere brother; e.g. nephew, (Genesis 13:8; 14:16) husband, (Solomon 4:9)
One of the same tribe. (2 Samuel 19:13)
Of the same people, (Exodus 2:11) or even of a cognate people. (Numbers 20:14)
An ally. (Amos 1:9)
Any friend, (Job 5:15)
One of the same office. (1 Kings 9:13)
A fellow man. (Leviticus 19:17)
Metaphorically of any similarity, as in (Job 30:19) The word adelphos has a similar range of meanings in the New Testament.

In other dictionaries

William Smith; revised by F. N. Peloubet and M. A. Peloubet; CrossWire SWORD module Smith 1.3

Bible Strong digital edition from CrossWire module 1.3, based on the 1884 Peloubet revision with later digital enrichments preserved