Usage priority
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
周期性的；定期的
先理解核心含义，再看它在真实句子里的用法。
周期性的；定期的
happening or recurring at regular intervals
The library subscribes to several periodical publications covering different subjects.
图书馆订阅了多种涵盖不同学科的定期出版物。
周期性的
Periodic.
定期出版,间隔超过一天,尤其是每周、每月或每季度
Published at regular intervals of more than one day, especially weekly, monthly, or quarterly.
定期发生或重复的
happening or recurring at regular intervals
与此类出版物有关的
Of, or relating to such a publication.
It is important to make periodical checks of the smoke detectors at home.
定期检查家中的烟雾报警器很重要。
Staff receive periodical training sessions to update their skills.
员工定期参加培训课程以更新技能。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Also compare
Use periodical naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.