In linguistics, vocal stress is the accent or emphasis given to each syllable in a piece of writing, as determined by conventional pronunciation. The amount and importance of vocal stress varies in languages. In some languages, vocal stress can determine the meaning of a word.
Poetry in English depends upon vocal stress to establish the meter of the poem. The vocal stress is usually thought of as strong or weak. Some people distinguish a third, intermediate stress level.
Example: In the word reconsider, the stress pattern is intermediate - weak - strong - weak.