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“recurrence”
An action or situation that is repeated or happens again: After Luke's exposure to poison ivy on the hike in the mountains, he had several recurrences of the itchy rash for several days.
Eugenia had a recurrence of cancer cells in the same place as before.
A unit related to:
“recurrence”
(Greek > Latin: recurrence, repetitious; back, backward, again; returning, repeating)