Quenya 

o(to)sta

fraction. one seventh

otosta

one seventh

otosta fraction "one seventh" (1/7). Also osta, otsat. (VT48:11)

osta

one seventh

osta (1) fraction "one seventh" (1/7). Also otosta, otsat. (VT48:11)

otsat

one seventh

otsat fraction "one seventh" (1/7). Also otosta, osta (VT48:11)

otsat

fraction. one seventh