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单词 unit
释义

WordReference Random House Learner's Dictionary of American English © 2024
u•nit /ˈyunɪt/USA pronunciation   n. [countable]
  1. a single thing;
    one person or thing.
  2. any group of things or persons thought of as a single thing:The team formed a unit.
  3. one of the individuals, parts, or elements into which a whole may be divided.
  4. one of a number of things that are identical or equivalent in function or form:a rental unit.
  5. a machine, part, or system of machines having a specified purpose, often an apparatus or piece that is part of a bigger piece:a heating unit.
  6. Weights and Measuresa specified amount of a quantity, as of length, volume, or time, by comparison with which any other quantity of the same kind is measured:a unit of measurement, as an inch.
  7. Mathematicsthe least positive integer;
    one.
See -uni-.
WordReference Random House Unabridged Dictionary of American English © 2024
u•nit  (yo̅o̅nit),USA pronunciation n. 
  1. a single thing or person.
  2. any group of things or persons regarded as an entity:They formed a cohesive unit.
  3. one of the individuals or groups that together constitute a whole;
    one of the parts or elements into which a whole may be divided or analyzed.
  4. one of a number of things, organizations, etc., identical or equivalent in function or form:a rental unit; a unit of rolling stock.
  5. any magnitude regarded as an independent whole;
    a single, indivisible entity.
  6. Weights and MeasuresAlso called dimension. any specified amount of a quantity, as of length, volume, force, momentum, or time, by comparison with which any other quantity of the same kind is measured or estimated.
  7. the least positive integer;
    one.
  8. MathematicsAlso called unit's place. 
    • (in a mixed number) the position of the first digit to the left of the decimal point.
    • (in a whole number) the position of the first digit from the right of the decimal point.
  9. a machine, part, or system of machines having a specified purpose;
    apparatus:a heating unit.
  10. Educationa division of instruction centering on a single theme.
  11. Militaryan organized body of soldiers, varying in size and constituting a subdivision of a larger body.
  12. Medicine
    • the measured amount of a substance necessary to cause a certain effect;
      a clinical quantity used when a substance cannot be readily isolated in pure form and its activity determined directly.
    • the amount necessary to cause a specific effect upon a specific animal or upon animal tissues.
  13. Mathematics
    • an identity element.
    • an element in a group, ring, etc., that possesses an inverse.
  • 1570; coined by John Dee as a translation of Greek mónas (previously rendered as unity); perh. influenced by digit

Unit., 
  1. Unitarian.

Collins Concise English Dictionary © HarperCollins Publishers::
unit /ˈjuːnɪt/ n
  1. a single undivided entity or whole
  2. any group or individual, esp when regarded as a basic element of a larger whole
  3. a mechanical part or integrated assembly of parts that performs a subsidiary function: a filter unit
  4. a complete system, apparatus, or establishment that performs a specific function: a production unit
  5. a subdivision of a larger military formation
  6. Also called: unit of measurement A standard amount of a physical quantity, such as length, mass, energy, etc, specified multiples of which are used to express magnitudes of that physical quantity: the second is a unit of time
  7. the amount of a drug, vaccine, etc, needed to produce a particular effect
  8. a standard measure used in calculating alcohol intake and its effect
  9. (modifier) having a value defined as one for the system: unit vector
  10. Also called: unit set a set having a single member
  11. short for home unit
  12. NZ a self-propelled railcar
Etymology: 16th Century: back formation from unity, perhaps on the model of digit
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