THESAURUS
Asymptote
approach, bottleneck, collision course, concentralization, concentration, concourse, concurrence, confluence, conflux, congress, convergence, converging, crossing, focalization, focus, funnel, hub, meeting, mutual approach, narrowing gap, radius, spokes, tangent
ROGET THESAURUS
Asymptote
Convergence
N
convergence, confluence, concourse, conflux, congress, concurrence, concentration, convergency, appulse, meeting, corradiation, assemblage, resort, asymptote, converging, convergent, confluent, concurrent, centripetal, asymptotical, asymptotic, confluxible.