constant

constant
adjective
  1. occurring continuously over a period of time
    不断的；连续的
    the constant background noise of the city.
    。
    the pain is constant.
    疼痛持续不断。
    ■remaining the same over a period of time
    不变的；始终如一的
    faxes do not print out at a constant speed.
    。
    the company has kept its prices fairly constant.
    公司一直保持价格不变。
    ■(of a person) unchangingly faithful and dependable
    （人）忠诚的，忠实的，忠贞的
noun
  1. a situation or state of affairs that does not change
    持久不变，始终如一
    the condition of struggle remained a constant.
    斗争情形保持不变。
    ■(Mathematics)a quantity or parameter that does not change its value whatever the value of the variables, under a given set of conditions
    (数)常数，常量；恒量
    ■(Physics)a number expressing a relation or property which remains the same in all circumstances, or for the same substance under the same conditions
    (物理)恒量
派生
constantly
adverb
语源
  1. late Middle English (in the sense 'staying resolute or faithful'): from Old French, from Latin constant- 'standing firm', from the verb constare, from con- 'with' + stare 'stand'. The noun senses date from the mid 19th cent
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