Essentiate \Es*sen"ti*ate\, v. t. [imp. & p. p. {Essentiated}; p. pr. & vb. n. {Essentiating}.] To form or constitute the essence or being of. [Obs.] --Boyle. Essentiate \Es*sen"ti*ate\, v. i. To become assimilated; to be changed into the essence. [Obs.] --B. Jonson.