unilateral

adjectives

involving only one part or side
"unilateral paralysis"; "a unilateral decision"
one-sided, unilateral
antonym
multilateral
tracing descent from either the paternal or the maternal line only
unilateral
is similar to
in a straight unbroken line of descent from parent to child
"lineal ancestors"; "lineal heirs"; "a direct descendant of the king"; "direct heredity"
direct, lineal