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Definition of Half-
1. Prefix. A prefix 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. ¹
2. Prefix. A prefix used to indicate that something is just half or done half, and therefore not total or fully done. ¹
¹ Source: wiktionary.com