noun
beginning period; initial term
Refers to the starting point or initial phase of a defined period, often used in legal, contractual, or scheduling contexts.
契約の始期は来月の1日です。
The contract's initial term starts on the first of next month.
始期と終期を明確に定めてください。
Please clearly specify the start and end dates.
Compound of 始 (beginning) and 期 (period, term).