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They started out from different languages.Ivan Seeking said:Why do "Flammable" and "Inflammable" mean the same thing?
derivation:
We get inflammable from the Latin verb inflammare, which combines flammare ("to catch fire") with a Latin prefix in- (more commonly seen as en- in English, as in enfold) meaning "to cause to be." This in- shows up occasionally in English words, such as indent and indebted, and it showed up in inflammable in the early 1600s.