1. Having the postage prepaid.

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

• postpay,
• postpond,
• oostpaid,
• lostpaid,
• -ostpaid,
• 0ostpaid,
• pistpaid,
• pkstpaid,
• plstpaid,
• ppostpaid,
• poastpaid,
• postpaids,
• postpaied,
• postpaide,
• postpayd,
• posthhoid,
• postpyraid,
• postpyramd,
• postpiramid,
• bestpaied

• postpartum,
• postpose,
• postponed,
• post-paid,
• postpone,
• postbag.

The adjective form of the word "postpaid" is "postpaid".

The plural form of "postpaid" is "postpaids".

The singular form of the word "postpaid" is "postpaid". It is already a singular form.