The mesomeric effect is an important concept in organic chemistry.

The Cotton effect is a phenomenon observed in the absorption of circularly polarized light by optically active molecules.

The effects of climate change are becoming more evident.

The medication has various side effects.

One possible side-effect of the medication is drowsiness.

Taking this medication may side-effect your sleep patterns.

The medication may cause some side effects.

The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.

The effusion of tears was a clear indication of her sadness.

The gyromagnetic effect is a phenomenon in physics.