(~s)
1.
Periodicals are magazines, especially serious or academic ones, that are published at regular intervals.
The walls would be lined with books and ~s.
N-COUNT
2.
Periodical events or situations happen occasionally, at fairly regular intervals.
She made ~ visits to her dentist.
= periodic
ADJ: usu ADJ n
~ly
Meetings are held ~ly to monitor progress on the case...
ADV: ADV with v