According to the current APNIC ASN policy document, the definition of multihomed is as below.
http://www.apnic.net/policy/asn-policy#3.4
3.4 Multihomed
A multi-homed AS is one which is connected to more than one other AS. An AS also qualifies as multihomed if it is connected to a public Internet Exchange Point.
In the ASN request form, you will be asked to provide the estimate ASN implementation date, two peer AS numbers and their contact details. It is also acceptable if your network only connect to an IXP.