English
fallrate
From fall + rate.
Proto-Indo-European *h₃elh₁- ‘to collapse’
Proto-Germanic *fallaną ‘to fall’
Proto-West Germanic *fallan ‘to fall’
Old English feallan ‘to fall’
Middle English fallen ‘to fall’
English fall
Proto-Indo-European *h₂reh₁- ‘to think’
…
Latin prō ratā parte ‘according to a fixed part’
Medieval Latin rata
Old French rate
Middle English rate
English rate
Today it means
noun The rate (velocity) of fall.
Language periods are conventional ranges, not dates for this word.
Etymograph / fallrate