There are three classes of activity:


Diurnal: active during daylight.
Crepuscular: active in twilight conditions (dawn/dusk).
Nocturnal: active in darkness.


While they are mutually exclusive, none is a perfect antonym for any other.

Antonym of "crepuscular"?
How it a Transistor an active device? Because it it not producing energy. We just feed it with energy and it amplifies it and that too not on his own but using a bias battery. So how it is considered to be an active device? Please can anyone provide full explanation?
