Plural of grammar; the systems of rules for how words work together to form sentences in a language.
From Greek 'gramma' meaning 'letter' or 'something written,' leading to 'grammata' (plural) and Latin 'grammatica,' eventually becoming 'grammar' in English by the 12th century.
Every language has a grammar whether it's written down or not—even slang and dialects follow patterns, which is why linguists study 'grammars' of all kinds of speech, not just formal ones!
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