(idiomatic) An initiating cause of a chain of events which leads to an outcome or effect of interest.

(transitive) The action of identifying the cause of a chain of events which leads to an outcome or effect of interest. To root cause something's root cause does not necessarily imply the use of root cause analysis (RCA).

(idiomatic) People and society at the local (most basic) level rather than at the national centre of political activity / The essential foundation or source of something

A beverage, most often a carbonated soft drink made from a combination of vanilla, cherry tree bark, licorice root, sarsaparilla root, sassafras root bark, nutmeg, anise, and molasses, among other things.

Ginger, the underground stem, or rhizome, of the plant Zingiber officinale.

(US) The root of the liquorice plant, Glycyrrhiza glabra, from which a sweet flavoring with an anise scent is extracted. / Glycyrrhiza, especially Glycyrrhiza lepidota (American licorice)

(idiomatic, chiefly US) Alternative form of root about

(of a pig, literally) To forage by poking the snout here and there. / To search for something in a similar manner. / (figuratively) To rummage; to look for something in a somewhat aimless fashion.

(mathematics) Of a number or expression, a number or expression the cube of which is equal to the given number or expression.

(intransitive, literally) To grow roots into soil. / (intransitive, figuratively) To become established, to take hold.