A dialectal variant of at.
A suffix of French or other Romance origin, properly diminutive in force, as in billet, billet, bullet, fillet, hatchet, islet, jacket, locket, mallet, pallet, pullet, ticket, etc.
A suffix of Latin origin, another form of -ate, -ad, as in ballet, sallet, sonnet, etc. Compare the doublets ballad, salad, sonata.