Berdasarkan Pekerjaan Umum: anil (annealing) = suatu proses perlakuan panas dimana ukuran butir mikrostruktur suatu bahan meningkat, menyebabkan perubahan pada sifatnya seperti kekuatan dan kekerasan.
http://www.pu.go.id/satminkal/balitbang/sni/istilah_definisi...

sedangkan definisi lengkap menurut WIKI adalah:
Annealing, in metallurgy and materials science, is a heat treatment wherein a material is altered, causing changes in its properties such as strength and hardness. It is a process that produces conditions by heating to above the re-crystallization temperature and maintaining a suitable temperature, and then cooling. Annealing is used to induce ductility, soften material, relieve internal stresses, refine the structure by making it homogeneous, and improve cold working properties.


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Note added at 6 hrs (2009-09-27 08:42:51 GMT)
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menurut Kamus Teknik B.S. Anwir dkk, anneal (k.k.) = dipijar dingin