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UK [ɪnˈɡriːdɪənt] / US [ɪnˈɡrɪdɪənt] noun [countable]
Word forms "ingredient":
singular ingredient plural ingredients
a) one of the foods or liquids that you use in making a particular meal

Mix all the ingredients together and place them in a shallow dish.

The food is home cooked using fresh ingredients.

b) one of the substances that are combined to make something. The active ingredient of a drug or medicine is the thing that makes it effective

Our products contain only natural ingredients.

2) one of the things that give something its character or that make it effective
an essential/vital/important ingredient:

Good communication is an essential ingredient of good management.

English dictionary. 2014.