'seizability' originates from the English verb 'seize' combined with the suffix '-ability', where 'seize' meant 'to take possession' and the suffix '-ability' (from Old French '-abilité' via Latin '-abilitas') meant 'capacity or capability'.

'seize' entered English from Old French 'seisir' (Modern French 'saisir') and appeared in Middle English in forms such as 'seisen'/'seize'; the productive English suffix '-ability' (from French '-abilité' and Latin '-abilitas') was attached to form 'seizability'.

Initially, 'seize' meant 'to take possession' or 'take hold of'; combined with '-ability' it evolved to the noun meaning 'the quality of being able to be taken (seized)', used especially in legal contexts.