Inclusive design is:
…[t]he design of mainstream products and/or services that are accessible to, and usable by, as many people as reasonably possible … without the need for special adaptation or specialised design.
– British Standards Institute1
i.e. a design methodology that considers everyone, including the 20% of the population who identify as having a disability (“difficulty” in Microsoft parlance).
“Inclusive”, then, means designing products that may address the needs of a wide® range of potential customers/users, including those with disabilities and/or difficulties e.