Easton's Dictionary
The month of gifts, i.e., of vintage offerings; called Tisri
after the Exile; corresponding to part of September and October.
It was the first month of the civil year, and the seventh of the
sacred year (1 Kings 8:2).
International Standard Bible Encyclopedia
eth'-a-nim ('ethanim):
The seventh month of the Jewish year (1Ki 8:2). The word is of Phoenician origin and signifies "perennial," referring to living streams. It corresponds to September-October.
See CALENDAR; TIME.