timeliness
  合時;適時;剛巧
  Time·li·ness n. The quality or state of being timely; seasonableness; opportuneness.
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  timeliness
       n 1: being at the right time [syn: seasonableness] [ant: unseasonableness,
             unseasonableness]
       2: timely convenience [syn: opportuneness, patness] [ant: inopportuneness]