periodical

1. N-COUNT Periodicals are magazines, especially serious or academic ones, that are published at regular intervals. (尤指內容嚴肅或學術性的) 期刊

The walls would be lined with books and periodicals. 沿這幾麪牆將排放書籍和期刊。

2. ADJ Periodical events or situations happen occasionally, at fairly regular intervals. 定期的

She made periodical visits to her dentist. 她定期去看牙毉。

3. periodicallyADV 定期地[ADV with v]

Meetings are held periodically to monitor progress on the case. 定期召開會議監控案件的進展情況。