Describable

For Halliday, grammar is described as systems not as rules, on the basis that every grammatical structure involves a choice from a describable set of options.

I have to come back to it here, however, for the particular flavor of "Kubla Khan", with its air of mystery, is describable in part through that convenient phrase.

It does not describe such concepts as name spaces very well at all, and the differences between a definition and a reference is not clearly describable either.

Visible light, which occupies a middle ground in frequency, can easily be shown in experiments to be describable using either a wave or particle model, or sometimes both.