Source : Webster's Revised Unabridged Dictionary (1913)

Subpoena \Sub*p[oe]"na\, v. t. [imp. & p. p. {Subp[oe]naed}; p.
   pr. & vb. n. {Subp[oe]naing}.] (Law)
   To serve with a writ of subp[oe]na; to command attendance in
   court by a legal writ, under a penalty in case of
   disobedience.