letter

"letter" means any form of written communication or other document that is directed to a specific person or a specific address and is to be conveyed other than by electronic means; and includes a packet, package, wrapper or article containing any such communication;
ACT 465 - POSTAL SERVICES ACT 1991
2. Interpretation.

letter

"letter" means any form of written communication or document of communication in an envelope or a small packet that is directed to a specific person or a specific address which is conveyed other than by electronic means, and excludes categories which are specified under section 12;
ACT 741 - POSTAL SERVICES ACT 2012
2. Interpretation