God's chosen one: a person or people God has singled out and claimed as his own.
Every time this word appears, it points to someone on the receiving end of God's choice. It is the flip side of the verb בָּחַר, "to choose": not the one doing the choosing but the one chosen. And in the Hebrew Bible the chooser is always God.
The same title stretches across very different figures. It marks a single king (David), the servant on whom God puts his Spirit, and Moses standing in the gap for a rebellious people. It also names the whole nation of Israel, chosen not for its size or merit but because God set his love on it. In the later chapters of Isaiah the word narrows again, this time to the faithful within Israel who will inherit God's promises.
What holds these uses together is not the identity of the one chosen but the fact of the choosing. To be God's chosen is to be claimed for a purpose: to rule, to serve, to carry a mission, or simply to belong to God as his own people.