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Etymology 1
Compare.

Verb

 * 1) to be one, to be single
 * 2) to be alone
 * 3) to be unified, to be reduced to one
 * 4) to isolate oneself, to live in solitude
 * 5) to become an original
 * 6) to do alone

Noun

 * 1) condition of being single or sole
 * 2) loneliness
 * 3) isolation
 * 4) autism
 * 1) autism