Relating to or active during the night

रात का

English Usage: Bats are nocturnal creatures that hunt for insects at night.

Hindi Usage: चमगादड़ रात का प्राणी है जो रात में कीड़ों का शिकार करता है.

The quality or character of being periodic; regular recurrence or repetition

आवृत्ति

English Usage: The periodicity of the moon phases is approximately 29.5 days.

Hindi Usage: चंद्रमा के चरणों की आवृत्ति लगभग 29.5 दिन है.