empty

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having nothing inside or on the surface; holding or containing nothing.
• adjective Mathematics Having no elements or members; null.
• adjective Having no occupants; not being used.
• adjective Not having an incumbent or occupant; unfilled.
• adjective Not put to purposeful use; idle.
• adjective Lacking force or power.
• adjective Lacking purpose or substance; meaningless.
• adjective Needing nourishment; hungry.
• adjective Devoid; destitute.
• intransitive verb To remove the contents of.
• intransitive verb To transfer or pour off completely.
• intransitive verb To unburden; relieve.
• intransitive verb To become empty.
• intransitive verb To discharge its contents.
• noun An empty container.

from The Century Dictionary.

• To deprive of contents; remove, pour, or draw out the contents from; make vacant: with of before the thing removed: as, to empty a well or a cistern; to empty a pitcher or a purse; to empty a house of its occupants.
• To draw out, pour out, or otherwise remove or discharge, as the contents of a vessel: commonly with out: as, to empty out the water from a pitcher.
• To discharge; pour out continuously or in a steady course: as, a river empties itself or its waters into the ocean. [A strained use, which it is preferable to avoid, since a river is not emptied by its flow into the ocean.]
• To lay waste; make destitute or desolate.
• To become empty.
• To pour out or discharge its contents, as a river into the ocean.
• Containing nothing, or nothing but air; void of its usual or of appropriate contents; vacant; unoccupied: said of any inclosure or allotted space: as, an empty house or room; an empty chest or purse; an empty chair or saddle.
• Void; devoid; destitute of some essential quality or component.
• Destitute of force, effect, significance, or value; without valuable content; meaningless: as, empty words; empty compliments.
• Destitute of knowledge or sense; ignorant: as, an empty coxcomb.
• Forlorn from destitution or deprivation; desolate; deserted.
• Wanting substance or solidity; lacking reality; unsubstantial; unsatisfactory: as, empty air; empty dreams; empty pleasures.
• Not burdened; not bearing a burden or a rider: as, an empty horse.
• Not supplied; without provision.
• Wanting food; fasting; hungry.
• Bearing no fruit; without useful product.
• Producing no effect or result; ineffectual.
• Synonyms Void, etc. (see vacant); unoccupied, bare, unfurnished.
• Weak, silly, senseless.
• Unsatisfying, vain, hollow.
• noun An empty vessel or other receptacle, as a box or sack, packing-case, etc.; an empty vehicle, as a cab, freightcar, etc.: as, returned empties.

from the GNU version of the Collaborative International Dictionary of English.

• noun An empty box, crate, cask, etc.; -- used in commerce, esp. in transportation of freight.”
• transitive verb To deprive of the contents; to exhaust; to make void or destitute; to make vacant; to pour out; to discharge
• intransitive verb To discharge itself.
• intransitive verb To become empty.
• adjective Containing nothing; not holding or having anything within; void of contents or appropriate contents; not filled; -- said of an inclosure, or a container, as a box, room, house, etc.
• adjective Free; clear; devoid; -- often with of.
• adjective Having nothing to carry; unburdened.
• adjective Destitute of effect, sincerity, or sense; -- said of language.
• adjective Unable to satisfy; unsatisfactory; hollow; vain; -- said of pleasure, the world, etc.
• adjective Producing nothing; unfruitful; -- said of a plant or tree.
• adjective Destitute of, or lacking, sense, knowledge, or courtesy
• adjective Destitute of reality, or real existence; unsubstantial.