hemera (Greek #2250)
day, i.e. (literally) the time space between dawn and dark, or the whole 24 hours (but several days were usually reckoned by the Jews as inclusive of the parts of both extremes); figuratively, a period (always defined more or less clearly by the context)
KJV usage: age, + alway, (mid-)day (by day, (-ly)), + for ever, judgment, (day) time, while, years.
Pronounce: hay-mer'-ah
Origin: feminine (with 5610 implied) of a derivative of ἧμαι (to sit; akin to the base of 1476) meaning tame, i.e. gentle