sin ‧ gle ‧ ness /ˈsɪŋɡ ə lnəs, ˈsɪŋɡ ə lnɪs/ BrE AmE noun
[ Word Family: noun : ↑ single , singles, ↑ singleness , the singular, ↑ singularity ; adverb : ↑ singly , ↑ singularly ; adjective : ↑ single , ↑ singular ]
singleness of purpose formal great determination when you are working to achieve something