The concept of reasonable accommodation is well entrenched in case law, particularly in human rights case law. We've already heard the department officials say that the Canada Human Rights Act applies to this legislation. The word “reasonable” is a modifier in the context of what accommodation is required. Without the word “reasonable”, it could purport to require all manner of accommodation, including all manner of costs. “Reasonable accommodation” in an employment context, for example, is used to modify the requirements placed on an employer, based on means, resources, and so on.
As to whether “disabled” or “accommodation” is defined, since we're interpreting this legislation under the lens of the Canada Human Rights Act, the words “disability” and “accommodation” would be interpreted from that perspective.