Living together
The co-existence is the way, exist in living creatures, provided they in relation to one another. It is the subject of sociology and other social sciences .
The term is mostly used when talking about human life contexts or those in which people are involved. For example, forms of institutionalized and non- institutionalized coexistence can be distinguished. One of the most common forms of human coexistence is the permanent connection of sexual partners in unions ( partnerships , marriages ).
But coexistence is also possible with other living beings, but is usually called differently: ectosymbiosis , symbiosis , couple bond .
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Wiktionary: Living together - explanations of meanings, word origins, synonyms, translations