Main

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The main is a headmate who is considered by the rest of the system to be one the main or central influences on the system. This doesn't necessarily mean they front often. There can be more than one main.

Related Terms
The host is the headmate who is most responsible for fronting or day to day activity, which is not necessarily the same as the main(s).

The core is the headmate with the closest ties to the pre-plural self. This is also not necessarily the same as the main(s).