There are 2 definitions of lighten in English:

lighten1

Syllabification: light·en
Pronunciation: /ˈlītn
 
/

verb

  • 1Make or become lighter in weight, pressure, or severity: [with object]: efforts to lighten the burden of regulation [no object]: the strain had lightened
    More example sentences
    • When they had eaten enough, they lightened the ship, throwing out the wheat into the sea.
    • The menu has been conceived along American or lightened Continental lines, and despite an occasional, surprising flaw, the food is generally well prepared.
    • To make matters worse, Ellen wasn't lightening the homework load one bit.
    Synonyms
    make lighter, lessen, reduce, decrease, diminish, ease; alleviate, mitigate, allay, relieve, palliate, assuage
  • 1.1Make or become more cheerful or less serious: [with object]: she attempted a joke to lighten the atmosphere [no object]: Robbie felt her spirits lighten a little
    More example sentences
    • But Dad, he seriously needs to lighten up, maybe get a girlfriend or something.
    • As usual, there was a large group of rowdy sailors surrounding the table, which actually helped to lighten up the heavy atmosphere.
    • I guess they were trying to lighten up the atmosphere… or something like that.
    Synonyms
    cheer (up), brighten, gladden, hearten, perk up, lift, enliven, boost, buoy (up), uplift, revive, restore, revitalize

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Word of the day skosh
Pronunciation: skəʊʃ
noun
a small amount; a little

There are 2 definitions of lighten in English:

lighten2

Syllabification: light·en
Pronunciation: /
 
ˈlītn/

verb

  • 1Make or become lighter or brighter: [no object]: the sky began to lighten in the east [with object]: she had lightened her hair
    More example sentences
    • As the sky began to lighten in the east, humans and lizards moved quickly through the trees, wearing earthen colors and staying as low as possible to the ground.
    • The sky was beginning to lighten in the east, which meant they were running out of time.
    • I could watch the last star fade as the sky lightened and birds began to chatter amongst themselves about the coming day.
    Synonyms
    make lighter, make brighter, brighten, light up, illuminate, throw/cast light on, shine on, irradiate
    literary illumine, illume
    whiten, make whiter, bleach, blanch, make paler
  • 1.1 [with object] archaic Enlighten spiritually: now the Lord lighten thee, thou art a great fool
  • 2 [no object] (it lightens, it is lightening, etc.) • rare Emit flashes of lightning; flash with lightning: it thundered and lightened

Usage

Years ago, the phrase it is lightening (as in ‘thundering and lightening’) was contracted to it is light’ning, which eventually became further shortened to it is lightning. In modern use, the word lightning stands on its own as a noun ( did you see that lightning? ) and a verb ( it looks as if it’s going to start lightning ). Today, in the context of electrical storms, lightening would likely be considered a misspelling of lightning, rather than a variant spelling.

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