What defines a "Dimeter" in poetry?

A dimeter in poetry is defined by having two beats or stressed syllables per line. This metric form creates a rhythmic and concise structure that contributes to the overall sound and feel of the poem. In practice, each line of dimeter typically features two iambs, which establish a strong rhythmic pulse. This simplicity can enhance the emotional impact of the words chosen, allowing for a direct and powerful expression of ideas.

The other choices do not accurately define dimeter. Thematic complexity, character presence, and rhyme schemes pertain to different aspects of literary analysis and don't relate specifically to the metrical definition of dimeter. Therefore, the characterization of dimeter as having two beats or stressed syllables is what makes this choice correct.