0 a short period of time; a moment:
"Come on! We're going to be late." "Hang on a mo! I'll just get my wallet."
I'll be with you in a mo (= very soon).
1 abbreviation for money order US
2 abbreviation for medical officer
3 written abbreviation for the US state of Missouri: used in addresses
4 written abbreviation for mail order :
MO business is dropping, while Internet-only purchases are up.
5 written abbreviation for money order :
Include personal check or MO for $15 with your request.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
mo