Etymological fallacy
From Wikipedia, the free encyclopedia
An etymological fallacy is a linguistical misconception based on the idea that the etymology of a word or phrase is its actual meaning. For example, the meaning of the word prevent may be thought to signify "to go before" based on its etymology: from the Latin prae + venire. This falsely deduced meaning is a fallacy due to the fact that it fails to take into account semantic changes over time.
Native and non-native speakers pick up the meaning from reflecting on contextual usage. In day-to-day usage, most speakers of a language will rely on the context of a word or phrase and deduce the meaning from it rather than an etymology which may, in any case, not be at all clear, particularly if it is based in a foreign or archaic language.