1. A shudder or shiver, as of excitement, fear, or pleasure.
2. A brief intense reaction, usually a feeling of excitement, recognition, or terror, accompanied by a physical shudder or thrill.
3. This word comes from the Late 18th century via French, literally "shiver," from Latin frigere "to be cold".

Its relationship to cold, frigere, is based on the fact that when people are cold, they usually shiver.