<p><strong>Verb (used with object):</strong></p><ul><li>to unite or join so as to increase the number, quantity, size, or importance: to add two cups of sugar; to add a postscript to her letter; to add insult to injury.</li><li>to find the sum of (often followed by up): Add this column of figures. Add up the grocery bills.</li><li>to say or write further.</li><li>to include (usually followed by in): Don't forget to add in the tip.</li></ul><p><strong>Verb (used without object):</strong></p><ul><li>to perform the arithmetic operation of addition: children learning to add and subtract.</li><li>to be or serve as an addition (usually followed by to): His illness added to the family's troubles.</li></ul><p><strong>Noun:</strong></p><ul><li>Journalism. copy added to a completed story.</li></ul><p><strong>Verb phrase:</strong></p><ul><li>to signify; indicate: The evidence adds up to a case of murder.</li></ul>