WordReference Random House Learner's Dictionary of American English © 2015
un•der /ˈʌndɚ/USA pronunciation prep. 
  1. beneath and covered by:She stood under a tree.
  2. below the surface of:They swam under water.
  3. at a point lower than:He got a bump just under his eye.
  4. in the position of trying to carry, support, endure, sustain, etc.:to sink under a heavy load.
  5. beneath the cover or disguise of:registered under a false name.
  6. beneath the heading of:Classify the books under "Fiction.''
  7. below in degree, amount, etc.; less than:These books were purchased under cost.
  8. below in rank:A corporal is under a lieutenant.
  9. working for; controlled by the authority, influence, or guidance of:studied violin under a great master.
  10. in accordance with;
    following:under the provisions of the law.
  11. during the administration or reign of:Those laws were passed under President Lincoln.
  12. in the state or process of:under construction; a bridge under repair.

  • below or beneath something:Go over the fence, not under.
  • beneath the surface of water:was held under by the seaweed.
  • in a lower degree, amount, etc.:selling shirts for $25 and under.
  • in a lower position or condition.
  • go under, [no object]
    • to give in; succumb;
    • to fail in business:His dry cleaning business went under.

  • located beneath or on the underside:the under threads of embroidery.
  • lower in position.
  • lower in degree, amount, rank, etc.:Children seven or under get in free.
  • being in a state of unconsciousness:The patient was under during the surgery (= The patient was unconscious because of the effect of the anesthetic).

  • under-, prefix. 
    • under- is attached to nouns and means: "a place or situation below or beneath:''underbrush; undertow.
    • under- is also used to mean "lower in grade, rank, or dignity:''undersheriff; understudy.
    • under- is also attached to adjectives to mean "of lesser degree, extent, or amount:''undersized.
    • under- is also used to mean "not showing enough; too little:''underfed.

    Collins Concise English Dictionary © HarperCollins Publishers::

    under /ˈʌndə/ prep
    1. directly below; on, to, or beneath the underside or base of: under one's feet
    2. less than: under forty years
    3. lower in rank than: under a corporal
    4. subject to the supervision, jurisdiction, control, or influence of
    5. subject to (conditions); in (certain circumstances)
    6. within a classification of: a book under theology
    7. known by: under an assumed name
    8. planted with: a field under corn
    9. powered by: under sail
    10. during the period that the sun is in (a sign of the zodiac): born under Aries
    1. below; to a position underneath something
    Etymology: Old English; related to Old Saxon, Gothic undar, Old High German untar, Old Norse undir, Latin infra

    'under' also found in these entries:

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    Look up "under" at Merriam-Webster
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