symbiosis

noun

1. (countable, uncountable)A relationship of mutual benefit, especially among different species.
2. (countable, uncountable)The close and long-term relationship or interaction between two or more different species.
3. (countable, especially, uncountable)The close and long-term relationship or interaction between two or more different species.

   “Bees and flowers display symbiosis. The bees get nectar and the flowers get pollinated.”

4. (countable, uncountable)The state of people of different types, races, cultures, communities, etc., living together.
5. (countable, uncountable)The occurrence of two different or opposing things in the same time and place.

   “In this peculiar and deadly symbiosis the presence of warfare stimulates trade and the presence of trade stimulates warfare.”