to produce or engender (something)

Despair often breeds violence

to propagate (plants or animals) sexually and usu under controlled conditions

to produce or engender

to inculcate (something) by training

We aim to breed good behaviour

to produce (fissile material for use in nuclear reactors or warheads) in a nuclear chain reaction in a breeder reactor

to produce offspring by sexual union

to propagate animals or plants

a group of animals or plants, often specially selected, visibly similar in most characteristics

race or lineage

a class or kind

We're seeing a new breed of radical