Definition of deci- in English:

deci-

combining form

(Used commonly in units of measurement) one tenth: decilitre

Origin

from Latin decimus 'tenth'.

Definition of deci- in:

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