an entrance lane for traffic from a street to a turnpike or freeway.
Origin of on-ramp
by analogy with off-ramp
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a ramp that provides access to the specified part of a road systeman interstate highway on-ramp
a method of accessing a service or facilityan important on-ramp to the on-line world
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012