1. The state of being rare.

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

• wareness,
• tireness,
• awreness,
• fareness,
• remeness,
• careness,
• barreness,
• rawenss,
• faireness,
• harenss,
• areness,
• arsneus,
• hareness,
• bairness,
• hadeness,
• ereness,
• lareness,
• rainess,
• rawreness,
• raresness

The adjective form of "rareness" is "rare".

The plural of the "rareness" can be the "rarenesses".

The singular of the "rareness" can be the "rareness".