1624, origin uncertain (first recorded use is by Capt. John Smith), perhaps from Middle French auvans, plural of auvent "a sloping roof," "itself of doubtful etym[ology]" (OED). A nautical term only until sense of "cover for windows or porch" emerged 1852.
1. He moved out from beneath an awning, reaching for something inside the breast of his overcoat.
2. A large green awning is set over the glass window to shelter against the sun.
3. Several people herded under an awning to get out the shower.
4. One evening, we sat talking very friendly together under an awning.