In a manner that is appliable; in a way that can be or is suitable for application.
From 'appliable' plus '-ly' (Old English suffix forming adverbs). Follows standard English pattern of making adjectives into adverbs describing how something is done.
English adverbs formed with '-ly' are so common we barely notice them, but 'appliably' shows the system working: adjective (appliable) + suffix (ly) = adverb describing manner!
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