English
rationable
From ration + -able.
Formed from ration + -able
Proto-Indo-European *h₂er- ‘to fit, to fix, to put together, to slot’
Latin reor ‘to compute’
Latin ratiō ‘reason, reasoning, explanation, ground,…’
French ration
English ration
Today it means
adj Suitable for being rationed.
Language periods are conventional ranges, not dates for this word.
Etymograph / rationable