Meaning

verb be compatible or in accordance with

verb follow through or carry out a plan without deviation

verb come or be in close contact with; stick or hold together and resist separation

originEtymology tree Proto-Indo-European *h₂éd Proto-Italic *ad Proto-Italic *ad- Latin ad- Latin haereō Latin adhaereōder. Middle English *adheren English adhere From Middle English *adheren (suggested by Middle English adherande (“adhering, adherent”, present participle)), from Latin adhaerēre, adhaesum: ad (“to”) + haerēre (“to stick”). Compare French adhérer.

Etymology from Wiktionary, CC BY-SA 3.0