Etymology
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isolate (v.)

"to set or place apart, to detach so as to make alone," by 1786, a back-formation from isolated (q.v.).

The translation of this work is well performed, excepting that fault from which few translations are wholly exempt, and which is daily tending to corrupt our language, the adoption of French expressions. We have here evasion for escape, twice or more times repeated; brigands very frequently; we have the unnecessary and foolish word isolate; and, if we mistake not, paralize, which at least has crept in through a similar channel. Translators cannot be too careful on this point, as it is a temptation to which they are constantly exposed. [The British Critic, April 1799]

As a noun, "something isolated," 1890; from earlier adjectival use (1819), which is from Italian isolato or Medieval Latin insulatus.

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Definitions of isolate

isolate (v.)
place or set apart;
They isolated the political prisoners from the other inmates
Synonyms: insulate
isolate (v.)
obtain in pure form;
The chemist managed to isolate the compound
isolate (v.)
set apart from others;
Synonyms: sequester / sequestrate / keep apart / set apart
isolate (v.)
separate (experiences) from the emotions relating to them;
From wordnet.princeton.edu