'attachability' originates from English, specifically formed from the verb 'attach' plus the adjective-forming suffix '-able' and the noun-forming suffix '-ity'.

'attach' in turn comes from Old French 'atachier' (modern French 'attacher'), ultimately from a Vulgar Latin formation; the English adjective 'attachable' was formed by adding '-able' to the verb, and 'attachability' is the later nominalization using '-ity'.

Initially, the root verb 'attach' meant 'to fasten or join'; over time the derived forms '-able' and '-ity' created nouns denoting the capacity or quality of being attached, which is the current meaning of 'attachability'.