Able to be attached, fastened, or connected to something else.
From attach (from Old French 'atacher,' to fasten) + '-able' (able to be), creating an adjective meaning 'capable of being attached.'
In our digital age, 'attachable' has taken on new life—'attachments' to emails didn't exist 40 years ago, but the old French word for 'fastening' perfectly described the concept when the technology arrived.
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