An agreement is the change made to a past participle verb or adjective to correspond, or "agree", with the noun in question. These agreements could represent plurals or genders. For instance, for most feminine nouns would take an "a" agreement at the end of the verb / adjective, whereas plurals would take "e" / "i". Example: la macchina (car) is feminine, so becomes LA macchina giallA and in plural form, LE macchinE giallE.