sanctify (verb) – to consecrate or make holy; to purify; to sanction
BREAKDOWN: SANCT- (sacred or holy) + -FY (to make or do)
— sanctity is the quality of being holy or sacred; saintliness
This word is built on the root SANCT-, which means sacred or holy.
Common SANCT- words include include saint and sanctuary.
More esoteric SANCT- words include sanctificate, sanctity, and sanctiloquence.