To become greater or more in size, quantity, number, degree, value, intensity, power, authority, reputation, wealth; to grow; to augment; to advance; -- opposed to decrease.(verb)
source: webster1913
To augment or make greater in bulk, quantity, extent, value, or amount, etc.; to add to; to extend; to lengthen; to enhance; to aggravate; as, to increase one's possessions, influence.(verb)