This is the 1177th most frequent Japanese word.
期限
Deadline; time limit; expiration.
期限 in this sentence refers to a deadline or due date for submitting the homework.
宿題の提出期限を過ぎてしまいました。
I missed the due date for submitting the homework.
期限 here denotes the expiration date or validity period for the membership registration.
この会員登録の有効期限は来月です。
The validity period of this membership registration is until next month.
期限 in this context refers to the time limit or deadline for renewing the contract.