Definition of single-o:
(adj) :
Not accompanied by anything else; one in number.
(adj) :
Not divided in parts.
(adj) :
Designed for the use of only one.
(adj) :
Performed by one person, or one on each side.
(adj) :
Not married, and (in modern times) not dating or without a significant other.
(adj) :
(botany) Having only one rank or row of petals.