Definition of -ial in English:

-ial

suffix

Forming adjectives such as celestial, primordial.

Origin

from French -iel or Latin -ialis.

Definition of -ial in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up