What is the meaning of Unitarian?

Espousing a unitary view of something

A Christian who denies the doctrine of the Trinity, usually stressing some distinctions between God the Father and God the Son without denying the divinity of Jesus.

Synonym of Muwahhid, a Muslim advocating God's strict unity.

Synonym of monotheist, a believer in the unity of God, particularly non-Christians (Muslims, Jews, etc.) discussed from a Christian perspective.

A person who rejects dualism in other contexts.

Unitarian

Source: wiktionary.org