From BiblePortal Wikipedia

Vine's Expository Dictionary of NT Words [1]

1: Ἐννέα (Strong'S #1767 — Noun — ennea — en-neh'-ah )

is found in  Luke 17:17 , and in connection with "ninety" (see below).

Wilson's Dictionary of Bible Types [2]

 Mark 15:34 (a) This time was  3:00 o'clock in the afternoon, the time of the evening sacrifice, prescribed by Moses. Jesus died at the time of the evening sacrifice.

 Luke 17:17 (c) This is the number of insufficiency wherein they failed to return, failed to bring their gratitude, failed to show themselves to the Lord, and were more content with the gift than with the Giver.

Webster's Dictionary [3]

(1): ( a.) Eight and one more; one less than ten; as, nine miles.

(2): ( n.) The number greater than eight by a unit; nine units or objects.

(3): ( n.) A symbol representing nine units, as 9 or ix.

King James Dictionary [4]

NINE, a. Denoting the number composed of eight and one as nine men nine days.

NINE, n. The number composed of eight and one or the number less by a unit than ten three times three.