Definition of lightening in English:

lightening

Syllabification: light·en·ing
Pronunciation: /ˈlītn-iNG, ˈlītniNG
 
/

noun

A drop in the level of the uterus during the last weeks of pregnancy as the head of the fetus engages in the pelvis.

Definition of lightening in:

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Word of the day oleaginous
Pronunciation: ˌōlēˈajənəs
adjective
rich in, covered with, or producing oil; oily