From Teflpedia

Context (/ˈkɒntekst/) is a property of language, consisting of situation and co-text. Context contributes significantly to the meaning of language, to the point where some utterances would be ambiguous or even not be understood at all without context.

An exception that proves the rule to the importance of context is that of idioms, which are often too obscure for students to usefully guess their meaning.

Context is so important that context creation in lessons is relevant.