Deciduosity is a technical term which refers to the ability of trees and plants to lose their leaves in autumn. However, there are several other words which can be used as synonyms for deciduosity. One such word is defoliation, which also refers to the process of losing leaves. Another synonym for deciduosity is abscission, which refers to the natural detachment of leaves, flowers and fruits from the plant. The word exfoliation can also be used to describe deciduosity. Exfoliation is mostly used for plants with a thin bark, where the outermost layer flakes off just like leaves. Overall, these synonyms for deciduosity offer options for writers to vary their language and avoid repetition.