As an adjective: serving to connect or join things together. As a noun: a word or element that joins words, phrases, or clauses.
From 'connect' plus the suffix '-ive', which means 'tending to' or 'serving to do.' It's been used since the 17th century in grammar and logic to describe linking elements.
'And,' 'but,' and 'because' are connectives in grammar—they're the glue holding sentences together—but 'connective' also describes biological tissue that binds organs together, showing how one word carries meaning across totally different fields.
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