a sound system that comes from more than one source and is routed through two or more speakers that surround the listener

Basically, stereo means a sound system that comes from more than one source and is routed through two or more speakers that surround the listener.

a two-channel sound reproduction system

In common usage, a "stereo" is a two-channel sound reproduction system, and a "stereo recording" is a two-channel recording.

the reproduction of sound using two separate audio channels in a way that creates the feeling of sound heard from spacious directions, as in natural hearing

Stereo is the reproduction of sound using two separate audio channels in a way that creates the feeling of sound heard from spacious directions, as in natural hearing.

a shortened version of the phrase "stereophonic sound system," which refers to sound recording equipment that uses at least two separate microphones and separate speakers in the production of recordings

"Stereo" is a shortened version of the phrase "stereophonic sound system," which refers to sound recording equipment that uses at least two separate microphones and separate speakers in the production of recordings.

which means 'solid' or three-dimensional

The word 'stereo' comes from the Greek word stereos, which means 'solid' or three-dimensional.

multiple audio sources ()

Stereo means multiple audio sources (or channels), and mono means one.

a pair of NASA solar observatory spacecraft STEREO, a particle physics neutrino experiment

Other uses STEREO, a pair of NASA solar observatory spacecraft STEREO, a particle physics neutrino experiment

3-dimensional

Stereo means solid (3 dimensional) and phone means sound, i.e., stereophony means “3 dimensional sound”.

a method of sound reproduction that creates an illusion of multi-channel audible perspective

Introduction Stereo is a method of sound reproduction that creates an illusion of multi-channel audible perspective.

to the number of audio channels: either one or two

“Mono” or “stereo” refers to the number of audio channels: either one or two.

to the method of recording in which two audio signals are processed

Stereo refers to the method of recording in which two audio signals are processed.

anything other than ‘solid’

Stereo does not mean anything other than ‘solid’ (look anything up).

three-dimensional

Stereo means three-dimensional; only minimum localization cues are required.

another technique for combining two stereo channels into a single (mono) chnannel which takes the arithmetic mean of the amplitude of both channels

Mean Stereo is another technique for combining two stereo channels into a single (mono) chnannel which takes the arithmetic mean of the amplitude of both channels.

a system using two speakers to give the sound more of a 'live' feel

Officially 'stereo' means a system using two speakers to give the sound more of a 'live' feel.

an illusion of space or depth

Stereo means an illusion of space or depth.

for the left ear

Stereo means you have one channel for the left ear, and a different one playing different sounds to the right ear.