Definition of -ison in English:

-ison

Syllabification: -ison

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 abjure
Pronunciation: abˈjo͝or
verb
solemnly renounce (a belief, cause, or claim)