The question of whether everyone sees seven colours in a rainbow is related to the idea of linguistic relativity. […] recent research suggests that the number of distinct colours observed and what these are called depend on the language that one uses, with people whose language has fewer colour words seeing fewer discrete colour bands.
Wikipedia has a sister project that presents hundreds of thousands of word definitions. It's called Wiktionary. Let's say you are writing a sentence and you want to create a link to the definition of a word, the understanding of which is crucial to understanding that article. But in this hypothetical situation, you don't want to link to the Wikipedia page for that word because doing so would be overkill. So, using our Source Editor, here's how you would provide a link to the definition of "understanding" on Wiktionary:
both [[wiktionary:understanding|]] and [[wikt:understanding|]] will display like this:
