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Sense: 1
Date: 1900-2000
Origin: mononucleosis
Sense: 2
Date: 1900-2000
Origin: monophonic 'mono' (20-21 centuries)

mono

1 noun
     
mon‧o1 [uncountable] informal
1 American EnglishMI an infectious illness that makes your lymph nodes swell and makes you feel weak and tired for a long time afterwards [= glandular fever British English]
2TCB a system of recording or broadcasting sound, in which the sound comes from only one direction [↪ stereo]

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