ROGET THESAURUS
middle term
Middle
N
middle, midst, mediety, mean, medium,
middle term, center &c, mid-course, mezzo termine, juste milieu, halfway house, nave, navel, omphalos, nucleus, nucleolus, equidistance, bisection, half distance, equator, diaphragm, midriff, intermediate, middle, medial, mesial, mean, mid, median, average, middlemost, midmost, mediate, intermediate, equidistant, central, mediterranean, equatorial, homocentric, in the middle, midway, halfway, midships, amidships, in medias res.
Compromise
N
compromise, commutation, composition,
middle term, mezzo termine, compensation, abatement of differences, adjustment, mutual concession.