<p><strong>Noun</strong></p><ul><li>the act of cleaving or splitting.</li><li>the state of being cleft.</li><li>the area between a woman's breasts, especially when revealed by a low-cut neckline.</li><li>a critical division in opinion, beliefs, interests, etc., as leading to opposition between two groups: a growing cleavage between the Conservative and Liberal wings of the party.</li><li>the tendency of crystals, certain minerals, rocks, etc., to break in preferred directions so as to yield more or less smooth surfaces.</li><li>the total or partial division of the egg into smaller cells or blastomeres.</li><li>the breaking down of a molecule or compound into simpler structures.</li></ul>