stereo

Stereo can be:

colloquially:
stereophonic, see under stereophony
stereophonically, see under stereophonically
stereophonic broadcasting
stereophonic recording
stereophonic sound (stereo sound)
stereophonic reproduction
stereophonic device
the first part of compound words with the meaning:
spatial (e.g. stereo photography)
stereophonic, relating to stereophony (e.g. stereogramophone)
stereoscopic, relating to stereoscopy