WordNet sense 1 (lean flesh of any of several flatfish):

fillet of sole

WordNet sense 2 (being the only one; single and isolated from others):

lone, lonesome, only, solitary

WordNet sense 3 (existing alone or consisting of one entity or part or aspect or individual):

single

WordNet sense 4 (not divided or shared with others):

exclusive

WordNet sense 5 (not shared):

unshared

WordNet sense 6 (put a new sole on):

resole