τηρέω
tereo (tay-reh'-o) v.
1. to guard (from loss or injury)
2. (properly) by keeping the eye upon, i.e. to note (a prophecy)
3. (... figuratively) to fulfil a command
4. (by implication) to detain in custody
5. (... figuratively) to maintain
6. (by extension) to withhold for personal ends
7. (... figuratively) to keep unmarried
{differs from G5442, which is properly to prevent escaping; and from G2892, which implies a fortress or full military lines of apparatus}
[from teros "a watch" (perhaps akin to G2334)]
KJV: hold fast, keep(- er), (pre-, re-)serve, watch
Compare: G5442, G2892
See also: G2334