Interjection

1. hi, hello
2. Denotes the end of a radio transmission.

   Golf Golf Whiskey Golf, cleared the ILS runway one two, contact Sault Tower on one one eight decimal eight, g'day.

Usage notes

• G'day is used as an everyday greeting in Australia and New Zealand in the way that hello is in the UK and hi is in the US. It is most commonly conjugated as G'day, mate which can imply a greeting to a friend or a friendly greeting to a stranger. Less common usage is G'day, stranger or G'day. Howzit goin?
• Stereotypes: G'day is often stereotyped to be used commonly in Australian, although it is not as common as hi or hey, especially in most capital cities. It is also less common among young people than among adults.
• The expression has gained popularity with the increased exposure of Australian film and TV stars such as Steve Irwin and Paul Hogan.
• Although it is a contraction of the phrase Good day, the use of G'day as a parting comment is extremely uncommon.
• The expression also has a separate origin in the Ottawa Valley of Ontario, Canada.