hac

As an adjective arabic

is related to the.

As a proper noun arabic

is a major semitic language originating from the arabian peninsula, and now spoken natively (in various spoken dialects, all sharing a single highly conservative standardized literary form) throughout large sections of the middle east and north africa.

As an initialism hac is

(us) hearing aid compatibility.

is likely misspelled.

has no English definition.

As an initialism HAC

is hearing aid compatibility.

Compatibility is a initialism of hac.

As a noun compatibility

is the state of being compatible; in which two or more things are able to exist or perform together in combination without problems or conflict.

As an initialism hac is

(us) hearing aid compatibility.