The Collaborative International Dictionary
subpena
Subpoena \Sub*p[oe]"na\, n. [NL., fr. L. sub under + poena punishment. See Pain.] (Law) A writ commanding the attendance in court, as a witness, of the person on whom it is served, under a penalty; the process by which a defendant in equity is commanded to appear and answer the plaintiff's bill. [Written also subpena.]
Subp[oe]na ad testificandum. [NL.] A writ used to procure the attendance of a witness for the purpose of testifying.
Subp[oe]na duces tecum. [NL.] A writ which requires a witness to attend and bring certain documents.
Wiktionary
subpena
n. (alternative form of subpoena English) vb. (alternative form of subpoena English)