(Britain, Royal Navy) A rating who is qualified to perform certain duties of seamanship.

(aeronautics) The rate at which an aircraft can change its roll attitude, typically expressed in degrees per second

(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.