Stress refers to which syllable or syllables in a word or phrase are "accented" or receive the most emphasis in their pronunciation.

The symbol for stress in the International Phonetic Alphabet is a raised vertical line /ˈ/ placed before the stressed syllable (a lowered vertical line /ˌ/ marks secondary stress). In English, the placement of stress can serve to differentiate words that are otherwise identical: for example, the verb record /rɪˈkɔrd/ and the noun record /ˈrɛkərd/.