• adjective:   (colloquial) Random; arbitrary.
• noun:   (colloquial, mildly derogatory) An arbitrary person with whom one has no shared social connection.
• noun:   (colloquial, mildly derogatory) A person going to a party without being invited.
• noun:   (colloquial) Anything selected at random.
• adjective:   Pertaining to randonnée or uphill skiing.

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