• (n.) The witnessing or concluding clause, duty attached; -- said of a writ, deed, or the like. • (n.) A witness.
Tes'te noun [ So called from Latin teste , abl. of testis a witness, because this was formerly the initial word in the clause.] (Law) (a) A witness. (b) The witnessing or concluding clause, duty attached; -- said of a writ, deed, or the like. Burrill. 
teste To bear witness formally.