sin·gly 
/ˈsɪŋgəli/ adverb
/ˈsɪŋgəli/ adverb formal : without another
▪ The birds can be seen singly or in groups. ▪ The books in the set cannot be sold singly. [=(more commonly) individually]
▪ The birds can be seen singly or in groups. ▪ The books in the set cannot be sold singly. [=(more commonly) individually]
