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Reduction means cooking a liquid until some of the water evaporates and the remaining liquid is thicker and has a more intense flavor.
Evaporation will reduce the amount of liquid in a dish and intensify flavours. In cooking it's called reduction.
If you're not a woman you shouldn't be cooking!
23 / 150 = 15.33, so approximately 15% reduction in cooking time.
Posteriori reduction means a confirmation of a reduction. a reduction that you confirm without doubt.