- a magazine or newspaper published at regular intervals期刊。
attrib.
1- occurring or appearing at intervals; occasional不时出现（或发生）的; 偶尔的：
she took periodical gulps of her tea.
她时不时地猛喝一大口茶。
1.1
- (of a magazine or newspaper) published at regular intervals（杂志, 报纸）定期出版的：
Britain's best periodical art magazine.
英国最好的定期出版的艺术杂志。
派生词