The definition of holy is religiously sacred or dedicated to God and religion.(adjective)
Holy is defined as a place of worship.(noun)
An example of holy is a church.
See holy in Webster's New World College Dictionary
Origin: ME holie < OE halig (akin to Ger heilig) < base of OE hal, sound, happy, whole: first used in OE as transl. of L sacer, sanctus, in the Vulg.
noun pl. holies
See holy in American Heritage Dictionary 4
adjective ho·li·er, ho·li·est
Origin: Middle English holi
Origin: , from Old English hālig; see kailo- in Indo-European roots.
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