1. An amicable relationship between one organism [the symphile] and its host colony of social insects.
2. An insect that lives with ants or other social insects as a guest in a relationship of symphilism.
3. A term for a kind of friendly symbiosis or commensalism existing between ants or termites and certain other insects; such as, certain beetles that they feed and tend as guests and which, in some cases, yield a sweet substance as food for the hosts.