tangent (n.)

• abutter
• approach
• asymptote
• axis
• beeline
• borderer
• bottleneck
• bystander
• chord
• concentration
• concourse
• concurrence
• confluence
• conflux
• congress
• convergence
• converging
• crossing
• diagonal
• diameter
• edge
• focalization
• focus
• funnel
• hub
• looker-on
• meeting
• neighbor
• normal
• onlooker
• perpendicular
• radius
• secant
• segment
• shortcut
• side
• straight
• straightaway
• vector