Morphological agreement refers to the grammatical phenomenon where the form of a word changes to match certain features of another word in a sentence. This often involves aspects like number, gender, or case. For example, in languages like Spanish or French, adjectives may change their endings to agree with the nouns they describe. In many languages, morphological agreement helps clarify relationships between words, making sentences easier to understand. For instance, in English, the verb form changes to agree with the subject in number, as seen in "He runs" versus "They run." This consistency aids in communication and comprehension.