Definitions

1. noun

A unit of length equal to one billionth of a meter, used to express the size of particles, molecules, or other small structures.

“The new microscope can measure objects as small as a few nanometers in diameter.”

2. noun

A unit of length used to express the wavelength of light or other electromagnetic radiation.

“The laser emitted light at a wavelength of 532 nanometers.”

3. noun

A unit of measurement for the size of particles or molecules, often used in the fields of physics and chemistry.

“The new discovery involved particles of a size measured in nanometers.”