An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) The doctrine or belief that there is no → God.
2) Disbelief in the existence of a supreme being or beings.

→ a-; → theism.

The belief or doctrine that there is only one → God.

→ mono-; → theism.

1) The doctrine that God is the transcendent reality of which the material universe and human beings are only manifestations: it involves a denial of God's personality and expresses a tendency to identify God and nature.
2) Any religious belief or philosophical doctrine that identifies God with the universe (Dictionary.com).

→ pan-; → theism.

The doctrine of or belief in more than one god or in many gods (Dictionary.com). → polydeism.

→ poly-; → theism.

The belief in one God as the creator and ruler of the universe, without rejection of revelation (distinguished from → deism).
2) Belief in the existence of a god or gods (opposed to → atheism) (Dictionary.com).

From the- variant of theo- before a vowel, from Gk. theos "god," from PIE root *dhes-, root of words applied to various religious concepts, such as L. feriae "holidays," festus "festive," fanum "temple."

Yzadân-bâvari, from yazdân "god," from Mid.Pers. yazetân "gods," ultimately from Proto-Ir. *iaz- "to sacrifice, worship, venerate," → deity.