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v. drift·ed, drift·ing, drifts
1. To be carried along by currents of air or water: a balloon drifting eastward; as the wreckage drifted toward shore.
2. To proceed or move unhurriedly or aimlessly: drifting among the party guests; a day laborer, drifting from town to town.
3. To live or behave without a clear purpose or goal: drifted through his college years unable to decide on a career.
4. To have no continuing focus; stray: My attention drifted during the boring presentation.
5. To vary from or oscillate randomly about a fixed setting, position, or mode of operation.
6. To be piled up in banks or heaps by the force of a current: snow drifting to five feet.
1. To cause to be carried in a current: drifting the logs downstream.
2. To pile up in banks or heaps: Wind drifted the loose straw against the barn.
3. Western US To drive (livestock) slowly or far afield, especially for grazing.
1. Something moving along in a current of air or water: a drift of logs in the river.
2. A bank or pile, as of sand or snow, heaped up by currents of air or water.
3. Geology Rock debris transported and deposited by or from ice, especially by or from a glacier.
a. A general trend or tendency, as of opinion. See Synonyms at tendency.
b. General meaning or purport; tenor: caught the drift of the conversation.
a. A gradual change in position: an iceberg's eastward drift.
b. A gradual deviation from an original course, model, method, or intention.
c. Variation or random oscillation about a fixed setting, position, or mode of behavior.
6. A gradual change in the output of a circuit or amplifier.
7. The rate of flow of a water current.
a. A tool for ramming or driving something down.
b. A tapered steel pin for enlarging and aligning holes.
a. A horizontal or nearly horizontal passageway in a mine running through or parallel to a vein.
b. A secondary mine passageway between two main shafts or tunnels.
10. A drove or herd, especially of swine.

[From Middle English, drove, herd, act of driving; see dhreibh- in Indo-European roots.]

drift′y adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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