(rail transport, road transport) A measure of reliability that expresses the average distance travelled by a type of lorry, bus, rolling stock, etc, before preventative or reparative maintenance is required.

A request for clarification of what the listener just said.

A request for clarification of an anterior statement or question. / An expression of surprise, annoyance, or disagreement to an anterior statement.

(informal, idiomatic) Indicating that one is serious and not joking about a matter.

(physics) The root mean square of the velocities of all the molecules in a volume of gas; directly proportional to its temperature in the case of an ideal gas.

plural of brake mean effective pressure

plural of mean distance between failure

(colloquial) You are familiar with the situation I am describing; used to establish common ground with the interlocutor

A standard defining a standardized isotopic composition of water.

Used to allude to something unsaid or hinted at.