The quality of being at hand when needed

The attribute of being easy to meet or deal with

Web accessibility, or eAccessibility, is the inclusive practice of ensuring there are no barriers that prevent interaction with, or access to, websites on the World Wide Web by people with physical disabilities, situational disabilities, and socio-economic restrictions on bandwidth and speed.

In transport planning, accessibility refers to a measure of the ease of reaching destinations or activities distributed in space, e.g. around a city or country.