› to become larger in amount or size, or to make something do this: increase by sth Sales have increased by 10%.increase to sth Our gross margin increased to 24%.increase in price/size/value Over the past two years the department has increased in size.the number/rate/level increases Staffing numbers increase during the summer months.increase gradually/slowly/steadily Bookings are increasing steadily. Interest rates have increased slightly. increase dramatically/rapidly/significantly The volume of work has increased dramatically. increase efficiency/production/productivity The new measures are intended to increase efficiency. to increase costs/prices/sales This process greatly increases manufacturing speeds. increasing adjective › An increasing number of customers shop online. increasingly adverb › Borrowers are becoming increasingly aware of their options, and tend to shop around.