significant wave height meaning

• [Defence]
  The average height of the third of waves observed during a given period of time.
  Significant wave height is used for evaluating the impact of waves and breakers on watercraft in the open sea and surf zones.
  See also surf zone.
  (JP 4-01.6)

• wave height:    [Defence] The vert ...
• significant:    Adjective: signifi ...
• height:    Noun: height  ...

Examples

1. significant wave height
2. significant wave height
3. The significant wave height is generally much lower than that of the North Sea.
4. In their weather products, they give ocean wave height forecasts in significant wave height.
5. This implies that one might encounter a wave that is roughly double the significant wave height.