adjective

1. Not normal; odd, unusual, surprising, out of the ordinary.

   “He thought it strange that his girlfriend wore shorts in the winter.”

2. Unfamiliar, not yet part of one's experience.

   “I moved to a strange town when I was ten.”

3. Having the quantum mechanical property of strangeness.

Synonyms: new, unfamiliar, unknown

noun

1. A person whom one does not know; a person who is neither a friend nor an acquaintance.

   “That gentleman is a stranger to me.  Children are taught not to talk to strangers.”

2. An outsider or foreigner.

3. One not admitted to communion or fellowship.

Synonyms: newbie, newcomer

verb

1. To estrange; to alienate.