I. mon‧o¹ /ˈmɒnəʊ $ ˈmɑːnoʊ/ noun [uncountable] informal
[Sense 1: Date: 1900-2000; Origin: mononucleosis]
[Sense 2: Date: 1900-2000; Origin: monophonic 'mono' (20-21 centuries)]

1. American English an infectious illness that makes your lymph nodes swell and makes you feel weak and tired for a long time afterwards Synonym : glandular fever British English

2. a system of recording or broadcasting sound, in which all the sound comes from only one direction ⇒ stereo

[TahlilGaran] Dictionary of Contemporary English ▲

II. mono² adjective
using a system of recording or broadcasting sound, in which all the sound comes from only one direction ⇒ stereo:
an old mono recording

[TahlilGaran] Dictionary of Contemporary English ▲

mono- /mɒnəʊ, -nə $ -noʊ, -nə/ prefix
[Language: French; Origin: Latin, from Greek, from monos 'alone, single']
one:
a monoplane (=a plane with only one wing on each side)
a monolingual dictionary (=dealing with only one language)

[TahlilGaran] Dictionary of Contemporary English ▲