The story
- Proto-Indo-European*h₂éd
- Proto-Italic*ad
- Proto-Italic*ad-
- Latinad-
- Latinhaereō
- Latinadhaereō
- Middle English*adheren
- English todayadhere
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 4.0.