In a way that can be easily understood or that makes sense given the circumstances.
From 'understand' (from Old English 'understandan,' to stand under or grasp mentally) plus '-ably' (adverb suffix). The word structure reflects the metaphor of grasping mentally.
We 'understand' by standing under something—the word treats comprehension as physically supporting yourself with knowledge, like standing on solid ground. That's why we say we 'grasp' ideas too!
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