The Collaborative International Dictionary of English v.0.48:

Kislev \Kislev\ (k[i^]s"l[u^]f; k[i^]s"l[u^]v; k[=e]s*l[e^]v"),
   n. [Heb.]
   the third month of the Jewish civil year; the ninth month of
   the ecclesiastical year in the Jewish calendar, occupying a
   part of November and a part of December. [Also spelled
   Chislev.]
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Chislev \Chis"lev\ (k[i^]s"l[u^]f; k[i^]s"l[u^]v;
   k[=e]s*l[e^]v"), n. [Heb.]
   The third month of the Jewish civil year; the ninth month of
   the ecclesiastical year in the Jewish calendar, occupying a
   part of November and a part of December; -- same as Kislev.

   Syn: Kislev.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Chislev
    n 1: the third month of the civil year; the ninth month of the
         ecclesiastical year in the Jewish calendar (in November and
         December) [syn: Kislev, Chislev]