Definition of "holy"

Dedicated to a religious purpose or a god.  examples

Revered in a religion.  examples

Morally perfect or flawless, or nearly so.  examples

Separated or set apart from (something unto something or someone else).  examples

Set apart or dedicated for a specific purpose, or for use by a single entity or person.  examples

(slang) Used as an intensifier in various interjections.

(slang) An expression of astonishment and awe.

(archaic) A thing that is extremely holy; used almost exclusively in Holy of Holies.  quotations