[air-uh-gram] 
| a sheet of lightweight paper, bearing an official postal stamp imprint, that is folded to form its own envelope and can be sent via airmail at a special, low rate because of its standard size, light weight, and lack of enclosures. |
| aer·o·gram also aer·o·gramme (âr'ə-grām') n. An airmail letter in the form of a lightweight sheet of stationery that folds into its own envelope for mailing at a low postage rate. Also called air letter. [aero- + (tele)gram.] |
əˌgræm