<p><strong>Adverb</strong></p><ul><li>Along, by, at, or to the side of something: We brought the boat alongside.</li></ul><p><strong>Preposition</strong></p><ul><li>Beside; by the side of: The dog ran alongside me all the way.</li><li>Informal: alongside of, compared with: Alongside of his brother, he is no student at all.</li></ul>