Anything driven at random. / A mass of matter which has been driven or forced onward together in a body, or thrown together in a heap, etc., especially by wind or water.

(intransitive) To move slowly, especially pushed by currents of water, air, etc. / (intransitive) To move haphazardly without any destination.

(sometimes derogatory) A person who moves from place to place or job to job. / (nautical) A type of lightweight sail used in light winds like a spinnaker.

The process whereby sand and shingle move along a beach shoreline when waves approach the shore at an angle.

(genetics, evolutionary theory) An overall shift of allele distribution in an isolated population, due to random fluctuations in the frequencies of individual alleles of the genes.

(idiomatic) To understand, at least on some basic or general level.

simple past tense and past participle of drift

The tendency of an organism to revert to instinctive behaviors that can interfere with the conditioned response.

A floating piece, or pieces, of wood that drifts with the current of a body of water. / Such a piece of wood that has been cast ashore.

Moving aimlessly or at the mercy of external forces. / Without direction, focus, or goal.