breed‧ing [uncountable]
1 when animals produce babies:
Open-sea fish lay several million eggs each breeding season.
2HBTA the activity of keeping animals or plants in order to produce animals or plants that have particular qualities:
the breeding of pedigree dogs
Benson took great care in selecting breeding stock (=animals you keep to breed from).
3 the fact of coming from a family of high rank and having polite social behaviour:
The young lieutenant had an air of wealth and good breeding.

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