Definitions

1. adverb

used to form the comparative and superlative forms of adjectives and some other words, or to indicate a particular manner or degree.

“He sings beautifully, but she sings more beautifully than him.”

2. noun

the suffix forming the comparative and superlative forms of adjectives and some other words.

“The -ly ending is added to adjectives to make their comparative and superlative forms.”