/
ˈtwʌɪlʌɪt/
n.
- the soft glowing light from the sky when the sun is below the horizon, caused by the reflection of the sun's rays by the atmosphere.
- a period or state of obscurity or gradual decline:
the twilight of his career.
Etymology
ME: from OE twi- ‘two’ (prob. here used in sense ‘half-’) + light1.