1. the inflection of nouns, pronouns, and adjectives to show grammatical relationships such as case, number, and gender
Usage: grammar
2. a gradual deterioration or decline
Usage: formal

Examples

• Latin has five major declensions for nouns.
• Students must memorize the declensions of German articles.
• The declensions in Russian can be challenging for English speakers.
• Ancient Greek declensions vary by gender and number.
• The declensions of the empire were evident in its weakening borders.
• Historians noted the gradual declensions in the civilization’s art and culture.