Mean solar time at the Greenwich Meridian.

Meaning that relies on self-reference in the text being understood.

the average length of a solar day, used for practical timekeeping

(mathematics, of a set of numbers or values) The square root of the arithmetic mean of the squares.

(physics) the average distance travelled between two similar events; especially by molecules in a gas or liquid, electrons or phonons in a crystal or neutrons in a moderator

Morally wrong actions are sometimes necessary to achieve morally right outcomes; actions can be considered morally right or wrong only by virtue of the morality of the outcome.

Alternative form of the end justifies the means

(mathematics) Any of various theorems that saliently concern mean values.

Used to ask the meaning of a word (replace “…” with a word).

(engineering) The predicted mean average time taken for a part or system to fail for the first time.