Definition of "perpend"

perpend¹

/pəˈpɛnd/

verb
third-person singular simple present perpends, present participle perpending, simple past and past participle perpended
1. (archaic) To ponder, consider.
  Quotations
  […] Perpend, / I have a daughter - have while she is mine […]
  c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene i], lines 104-15

perpend²

/pəˈpɛnd/

noun
plural perpends
1. A brick or stone that has its longest dimension perpendicular to the face of a wall, especially one that extends through the wall's entire thickness.
2. A vertical joint (usually mortar) between bricks or blocks in a horizontal course.