Synizesis is a linguistic phenomenon where two adjacent vowels merge together to form a single sound, commonly found in older forms of Greek and Latin. Similar terms for synizesis include contraction, coalescence, and fusion. In modern-day English, synizesis is not frequently used, but it is still relevant in the study of classical languages. Alternate words for synizesis are synaeresis, a process where two syllables are merged into one, or syllabic merging, where multiple vowels are combined into a single syllable. Synonyms for synizesis vary based on linguistic context and the specific language being analyzed, but they all refer to a process of vowel merging.