Definition of -sion in English:

-sion

Pronunciation: /ʃ(ə)n, ʒ(ə)n/

suffix

Forming nouns such as mansion, persuasion.

Origin

from Latin participial stems ending in -s + -ion.

Definition of -sion in:

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Word of the day humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music