In a manner related to counting or calculation (extremely rare or obsolete usage).
Hypothetical formation from 'compt' with the adverbial suffix '-ly,' though this word is not attested in major dictionaries and likely never achieved standard usage.
This word is so obscure it might never have actually existed as standard English—it represents what *could* theoretically be formed from English word-building rules, a 'ghost word' of the language.
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