adj

• (computing, programming, mathematics) Containing no elements (as of a string, array, or set), opposed to being null (having no valid value).
• (obsolete) Free; clear; devoid; often with of.
  "And I ſhal finde you emptie of that fault, Right ioyfull of your reformation."
• (of some female animals, especially cows and sheep) Not pregnant; not producing offspring when expected to do so during the breeding season.
  "Empty cow rates have increased in recent years."
• (obsolete, of a plant or tree) Producing nothing; unfruitful.
  "an empty vine"

verb

• (transitive, ergative) To make empty; to remove the contents of.
  "to empty a well or a cistern"
• (intransitive) Of a river, duct, etc: to drain or flow toward an ultimate destination.
  "Salmon River empties on the W shore about 2 miles below Bear River."

noun

• (chiefly in the plural) A container, especially a bottle, whose contents have been used up, leaving it empty.
  "Put the empties out to be recycled."