The Collaborative International Dictionary of English v.0.48:

Formalize \Form"al*ize\ (f[^o]rm"al*[imac]z), v. t. [imp. & p.
   p. Formalized (f[^o]rm"al*[imac]zd); p. pr. & vb. n.
   Formalizing (f[^o]rm"al*[imac]`z[i^]ng).]
   1. To give form, or a certain form, to; to model. [R.]
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   2. To render formal.
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