Meaning of PROPAGATION in English

noun Date: 15th century the act or action of propagating: as, increase (as of a kind of organism) in numbers, the spreading of something (as a belief) abroad or into new regions, enlargement or extension (as of a crack) in a solid body

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.