The Collaborative International Dictionary of English v.0.48:

Wakf \Wakf\ (w[u^]kf), n. [Ar. waqf.] (Moham. Law)
   The granting or dedication of property in trust for a pious
   purpose, that is, to some object that tends to the good of
   mankind, as to support a mosque or caravansary, to provide
   for support of one's family, kin, or neighbors, to benefit
   some particular person or persons and afterward the poor,
   etc.; also, the trust so created, or the property in trust.
   [Webster 1913 Suppl.]