lightening

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light·en 1

 (līt′n)
v. light·ened, light·en·ing, light·ens
v.tr.
1.
a. To make light or lighter; illuminate or brighten.
b. To make (a color) lighter.
2. Archaic To enlighten.
v.intr.
1. To become lighter; brighten.
2. To be luminous; shine.
3. To give off flashes of lightning.

light·en 2

 (līt′n)
v. light·ened, light·en·ing, light·ens
v.tr.
1. To make less heavy: I lightened my backpack by removing a large textbook.
2. To lessen the severity or oppressiveness of: lighten the workload. See Synonyms at relieve.
3. To make less worried or more cheerful: lighten the mood.
v.intr.
1. To become less in weight.
2. To become less oppressive, troublesome, or severe.
3. To become cheerful: The mood lightened when the party started.
Phrasal Verb:
lighten up Informal
To take matters less seriously: Everything will work out fine, so stop worrying and lighten up.

lightening

(ˈlaɪtənɪŋ)
n
(Gynaecology & Obstetrics) obstetrics the sensation, experienced by many women late in pregnancy when the head of the fetus enters the pelvis, of a reduction in pressure on the diaphragm, making it easier to breathe

lightening

- A drop in the level of the womb during the last weeks of pregnancy, as the head of the fetus engages in the pelvis.
See also related terms for womb.

lightening

The operation (normally carried out at anchor) of transferring crude oil cargo from a large tanker to a smaller tanker, so reducing the draft of the larger tanker to enable it to enter port.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.lightening - descent of the uterus into the pelvic cavity that occurs late in pregnancy; the fetus is said to have dropped
descent - a movement downward
2.lightening - changing to a lighter color
change of color - an act that changes the light that something reflects
bleach - the act of whitening something by bleaching it (exposing it to sunlight or using a chemical bleaching agent)
Translations

light·en·ing

n. [childbirth] aligeramiento, descenso del útero en la cavidad pélvica, gen. en la etapa final del embarazo.

lightening

n (obst) encajamiento, descenso del feto al final del embarazo
References in classic literature ?
The book is full of humor and wisdom, of stray lightenings, and deep growlings.
Now, these persistent assuagements of his misery, and lightenings of his load, had by this time begun to have the effect of making Mr.