What is the main feature that binds together the lines of iambic pentameter?

The main feature that binds together the lines of iambic pentameter is the syllable count. Iambic pentameter consists of lines that contain ten syllables, following the rhythm of five metrical feet called iambs. Each iamb consists of an unstressed syllable followed by a stressed syllable, creating a specific rhythmic pattern. This structured syllable count is what defines and characterizes iambic pentameter, allowing poets to create a consistent and pleasing cadence in their work.

Other elements like rhyme, imagery, and theme may play significant roles in poetry but are not intrinsic to the definition of iambic pentameter itself. While some lines may rhyme and contain vivid imagery or specific themes, these features do not define the meter, making syllable count the distinguishing characteristic of iambic pentameter.