<p><strong>Noun</strong></p><ul><li>The act of injecting.</li><li>Something that is injected.</li><li>A liquid injected into the body, especially for medicinal purposes, as a hypodermic or an enema.</li><li>State of being hyperemic or bloodshot.</li><li>Mathematics: a one-to-one function.</li><li>Also called insertion.</li><li>Aerospace: the process of putting a spacecraft into orbit or some other desired trajectory.</li></ul>