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Mar
23
awarded  Popular Question
Nov
13
comment Is there a semantic difference between “manipulable” and “manipulatable”?
With some additional research, it appears you're exactly right: "manipulate" was formed from "manipulation", which was the "-ation" (essentially "the process of") suffix applied to the Latin root word "manipulus", or "to work with the hand". So "manipulable" would mean "workable (with the hand)" while "manipulatable" would mean "able to be worked (with the hand)". In short, it's the same distinction between "usable" and "can be used", which is likely why we see "manipulable" in connection with psychology and "manipulatable" in connection with engineering (via Ngrams).
Nov
13
accepted Is there a semantic difference between “manipulable” and “manipulatable”?
Nov
12
asked Is there a semantic difference between “manipulable” and “manipulatable”?
Dec
5
awarded  Scholar
Dec
5
accepted Why is “back-” used in “back-order”?
Dec
4
awarded  Student
Dec
4
asked Why is “back-” used in “back-order”?
Jun
11
comment “Demonstratable” — a dictionary word, or just a well known hack?
Thou insists on a language that doth not change?
Feb
1
awarded  Informed
Jun
14
awarded  Supporter
Feb
16
awarded  Autobiographer