Definition of lightening in English:

lightening

Line breaks: light¦en|ing
Pronunciation: /ˈlʌɪt(ə)nɪŋ
 
/

noun

A drop in the level of the womb 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 envenom
Pronunciation: enˈvenəm
verb
put poison on or into; make poisonous