bisexuality - two sexualities

unisexuality - one sexuality (we usually segment this further because we’re interested in what the “one” is)

asexuality - no sexuality

bicycle - two cycles

unicycle - one cycle (only shows up in circuses)

acycle - no cycles (only shows up in graph-based math)

binary - counting system of 2s (useful)

unary - counting system of 1s (tallying, sometimes useful)

aary - counting system without any numbers (not useful)