Canonmate

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A canonmate is a headmate who shares the same canon (Timeline, AU, etc) with another. Specifically, a canonmante is a sourcemate with the same personal canon, or version of a source they hail from, which may include source memories that "match".

History
The term seems to originate from the kin community. Though explicit definitions show up rarely, the term is in casual use in posts and tags in Tumblr kin communities as early as 2015, including the term "canon call" as an analogue to source call.