(meteorology) The rate of change in an atmospheric variable, especially temperature, with increase of height.

Alternative spelling of birthrate

(telecommunications) The number of telephone lines per 100 people in a region.

(aviation) The rate at which an aircraft gains altitude. A negative rate of climb implies descent.

(UK) a rate (typically of money) that does not vary over time

(UK) Being or relating to a flat rate.

(finance) The percentage of an amount of money charged for its use per some period of time (often a year).

Offered for sale or rent at a lower than usual rate.

A percentage which a trader adds to the buy-in cost of goods in order to get the selling price.

(UK, military, nautical, historical) Of a Royal Navy ship of the line in the Napoleonic Era: having at least 100 guns across three gun decks, a complement of 850–875, and weighing approximately 2,500 tons burthen.