Falling within an accepted range of size, amount, power, quality, etc. / (of a tree or shrub) Growing alone as a free-standing plant; not trained on a post etc.

(astronomy) Any astronomical object of known diameter whose distance can then be calculated from the angle it subtends

plural of standard ruler

the time of day in the time zone that encompasses most of Alaska.

(linguistics) The form of the English language widely accepted as the usual correct form.

(sociolinguistics) A form of a language that is institutionally promoted, regarded as the most "correct" or neutral variety; used by a population for public and formal purposes.

plural of standard hydrogen electrode

A lamp supported by a tall vertical pole in order that light comes from above those seated in the vicinity.

The time of day in the time zone that encompasses the east coast of Canada, which lies on the Atlantic Ocean.

(law) In tort law, the degree of caution that a reasonable person should exercise in a given situation so as to avoid causing injury.