calm air

Noun
  1. Wind moving at less than 1 knot;
    0 on the Beaufort scale (synset 111451731)
    is a type of: air current, current of air, wind - air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure
    is a part of: beaufort scale, wind scale - an international scale of wind force from 0 (calm air) to 12 (hurricane)
    same as: calm

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