<p><strong>Noun</strong></p><ul><li>a deep, immeasurable space, gulf, or cavity; vast chasm.</li><li>anything that seems to be without end or is impossible to measure, define, or comprehend: the abyss of their grief and sorrow.</li><li>(in ancient cosmogony) the primal chaos before Creation.</li><li>the infernal regions; hell.</li><li>a subterranean ocean.</li></ul>