twilight
noun
[ ˈtwʌɪlʌɪt ]
• the soft glowing light from the sky when the sun is below the horizon, caused by the reflection of the sun's rays from the atmosphere.
• "she looked out on the beautiful twilight"
• a period or state of obscurity, ambiguity, or gradual decline.
• "he was in the twilight of his career"
Origin:
late Middle English: from Old English twi- ‘two’ (used in an obscure sense in this compound) + light1.