ἐφημερίαephēmería

diurnality, i.e. (specially) the quotidian rotation or class of the Jewish priests' service at the Temple, as distributed by families

Greek (New Testament) · G2183

Meanings

1. a course of daily services (Nehemiah 13:30, 1 Chronicles 25:8, and elsewhere).

2. a class or course of priests detailed for service in the temple (1 Chronicles 23:6, and elsewhere): Luke 1:5, Luke 1:8 (cf. MGr., ἐφημέριος, priest).

Same root

ἐφήμεροςephḗmeros · G2184for a day ("ephemeral"), i.e. diurnal

Where it appears

Appears 2 times in the Bible.

Luke 1:5 When Herod was king of Judea, there was a Jewish priest named Zechariah. He was a member of the priestly order of Abijah, and his wife, Elizabeth, was also from the priestly line of Aaron.
Luke 1:8 One day Zechariah was serving God in the Temple, for his order was on duty that week.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.