How can we taxonomize their experience, and differentiate it from hallucination, or psychotic break?
I understand you have to differentiate yourself from the POTUS, but perhaps a little skepticism would be helpful?
How does one differentiate between friends and business contacts?
1816, from Medieval Latin differentiatus, past participle of differentiare, from Latin differentia (see difference).
Originally a mathematical term; transitive and non-technical sense of "discriminate between" is from 1876. Earlier, difference had been used as a verb in this sense. Related: Differentiated; differentiating; differentiation.