con·cert /ˈkɑn(t)sɚ/
 音樂會,合奏,一致(vt.)協定,協調(vi.)協力


 Con·cert v. t. [imp. & p. p. Concerted; p. pr. & vb. n. Concerting.]
 1. To plan together; to settle or adjust by conference, agreement, or consultation.
    It was concerted to begin the siege in March.   --Bp. Burnet.
 2. To plan; to devise; to arrange.
    A commander had more trouble to concert his defense before the people than to plan . . . the campaign.   --Burke.


 Con·cert, v. i. To act in harmony or conjunction; to form combined plans.
    The ministers of Denmark were appointed to concert with Talbot.   --Bp. Burnet


 Con·cert n.
 1. Agreement in a design or plan; union formed by mutual communication of opinions and views; accordance in a scheme; harmony; simultaneous action.
    All these discontents, how ruinous soever, have arisen from the want of a due communication and concert.   --Swift.
 2. Musical accordance or harmony; concord.
    Let us in concert to the season sing.   --Cowper.
 3. A musical entertainment in which several voices or instruments take part.
 Visit by night your lady's chamber window
 With some sweet concert.   --Shak.
    And boding screech owls make the concert full.   --Shak.
 Concert pitch. See under Pitch.

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 concert
      n : a performance of music by players or singers not involving
          theatrical staging
      v 1: contrive (a plan) by mutual agreement
      2: settle by agreement; "concert one's differences"