I would argue against having a definition in print. There is a lot of literature around in Canada now on the general idea of security. There is a policy in place but it's about to change. It is interpreted in a broad way. It talks of hurricanes and floods at one end, all the way to a military attack on the country at the other end. Agreed, there is a lot of space in there for interpretation. It depends on the issue of the day, I think, but in terms of interpreting it, it's squarely in the hands of the government.
On May 2nd, 2017. See this statement in context.