Definition of deca- in English:

deca-

Pronunciation: /ˈdɛkə/
(also dec- before a vowel)

combining form

(Used commonly in units of measurement) ten; having ten: decahedron decane

Origin

from Greek deka 'ten'.

Definition of deca- in:

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Pronunciation: ˈflipənt
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not showing a serious or respectful attitude