<p><strong>Adverb</strong></p><ul><li>without lapse of time; without delay; instantly; at once: Please telephone him immediately.</li><li>Synonyms: forthwith.</li><li>Antonyms: later.</li><li>with no object or space intervening.</li><li>closely: immediately in the vicinity.</li><li>without intervening medium or agent; concerning or affecting directly.</li></ul><p><strong>Conjunction</strong></p><ul><li>Chiefly British: the moment that; as soon as.</li></ul>