Definition of singly adverb from the Oxford Advanced Learner's Dictionary

 

singly

 adverb
adverb
BrE BrE//ˈsɪŋɡli//
 
; NAmE NAmE//ˈsɪŋɡli//
 
 
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alone; one at a time synonym individually The stamps are available singly or in books of ten. Guests arrived singly or in groups. The perfumed oils can be used singly or blended with others.
See the Oxford Advanced American Dictionary entry: singly