Rarity is defined as the state of being uncommon or scarce. However, there are several synonyms for this word that can be used to express its meaning in different contexts. One possible synonym is 'uniqueness', which suggests that something is particularly remarkable or distinctive. Another possible alternative is 'scarce', which emphasises the rarity of an item or substance in terms of its limited supply. 'Preciousness' is a similar synonym that conveys a sense of value and worth. Finally, 'uncommonness' and 'rareness' can also be used to describe the rarity of an object or occurrence in a more formal style of writing.