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Synonyms for Unilateral (same or very similar meaning)

WordNet sense 1 (tracing descent from either the paternal or the maternal line only):
unilateralist

WordNet sense 2 (in a straight unbroken line of descent from parent to child):
direct, lineal

WordNet sense 3 (involving only one part or side):
one-sided


From the ODE community, based on WordNetadd/edit