Definition of -ison in English:

-ison

Pronunciation: /ɪs(ə)n/

suffix

(Forming nouns) equivalent to -ation (as in comparison, jettison).

Origin

from Old French -aison, -eison, etc., from Latin -atio(n)-.

Definition of -ison in:

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected