From Middle English anelen, onelen, from Old English anǣlan, onǣlan (“to set fire to, ignite, heat, inspire, incite, kindle, inflame, enlighten, burn, consume”), from Proto-Germanic *ana (“on”) + Proto-Germanic *ailijaną (“to burn”), from Proto-Indo-European *h₂eydʰ- (“to burn”). Related to Old English onāl (“burning, incense, that which is burnt”), Old English āl (“fire, burning”), Icelandic eldur (“fire”), Swedish eld (“fire, flame”), Danish ild (“fire”).
- (metallurgy) To subject to great heat, and then cool slowly for the purpose of rendering less brittle; to temper; to toughen.
- To strengthen or harden.
- There was more than one way to anneal them with regard to resolve.