1. The largest of the insular countries in Australasia.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• austrlia,
• asturalia,
• australin,
• australias,
• autralia,
• austrain,
• austrela,
• austrlian,
• austrialian,
• austarlia,
• australlian,
• austrailia,
• astralian,
• austrilia,
• aulstralian,
• australien,
• austrillia,
• austrailian,
• australina,
• australai

• astrantia,
• australasia,
• austere,
• astragal,
• astral,
• australasian,
• austronesia,
• auctorial,
• australian,
• austral,
• austronesian,
• austrian,
• austria,
• austerely,
• austrotaxus,
• austerlitz.

The adjective form of the word "Australia" is "Australian".

The plural form of the word "Australia" is "Australias".

The singular form of the word "Australia" is "Australia". The word remains the same in both singular and plural form.