tisri

from The Collaborative International Dictionary of English v.0.48

Tisri \Tis"ri\, n. [Heb. tishr[imac], fr. Chald. sher[=a]' to
   open, to begin.]
   The seventh month of the Jewish ecclesiastical year,
   answering to a part of September with a part of October.
   [1913 Webster]

from Easton's 1897 Bible Dictionary

Tisri
the first month of the civil year, and the seventh of the
ecclesiastical year. See {ETHANIM} (1 Kings 8:2). Called
in the Assyrian inscriptions Tasaritu, i.e. "beginning."

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