Via Graham Smith* is this definition which basically means “states must balance whether they can pass laws or regulations which impact citizens of other jursdictions”, or to quote an actual dictionary:

comity of nations noun phrase 1 : the courtesy and friendship of nations marked especially by mutual recognition of executive, legislative, and judicial acts 2 : the group of nations practicing international comity (MW)

The UK TCN is not balanced.

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[*] Who has been talking about it for years:

The challenge is to forge rules that enable cross-border reach when appropriate, yet prevent the exercise of jurisdiction when not appropriate. The same kinds of rules are unlikely to achieve both. An approach that enables a court to weigh up and balance a series of factors in deciding whether or not to make an extraterritorial order may have desirable flexibility for the first case. But where risk of jurisdictional overreach is concerned a multi-factorial approach may be more enabling than restraining. Hard stops are likely to be required.

See also Graham’s postings at https://www.cyberleagle.com/search?q=comity