periodic

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pe|ri|od|ic /p'ɪəri'ɒdɪk/
[ADJ] usu ADJ n
Periodic events or situations happen occasionally, at fairly regular intervals.
...periodic bouts of illness.
= periodicalpe|ri|od|ic ta|ble
[N-SING] the N
In chemistry, the periodic table is a table showing the chemical elements arranged according to their atomic numbers.

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