Source : Webster's Revised Unabridged Dictionary (1913)

Prolongate \Pro*lon"gate\, v. t. [imp. & p. p. {Prolongated}; p.
   pr. & vb. n. {Prolongating}.] [L. prolongatus, p. p. of
   prolongare. See {Prolong}.]
   To prolong; to extend in space or in time. [R.]