From Middle English half-, from Old English healf-, from Proto-Germanic *halba- (“half-”), from *halbaz (“half”). Cognate with Dutch half- (“half-”), German halb- (“half-”), Swedish halv- (“half-”), Icelandic hálf- (“half-”). More at half.
- half or partial; not complete
- Used before brother, sister, uncle, aunt, and so forth, to indicate that the person being identified is related only through one parent, grandparent, and so forth, rather than two.
- quarter- (prefix for a fourth part)