I. mon ‧ o 1 /ˈmɒnəʊ $ ˈmɑːnoʊ/ BrE AmE 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 node s swell and makes you feel weak and tired for a long time afterwards SYN glandular fever British English
2 . a system of recording or broadcasting sound, in which all the sound comes from only one direction ⇨ stereo
II. mono 2 BrE AmE adjective
using a system of recording or broadcasting sound, in which all the sound comes from only one direction ⇨ stereo :
an old mono recording