Which term describes a voter who does not align with any political party?

The term that accurately describes a voter who does not align with any political party is "independent voter." This designation indicates that the individual has chosen not to affiliate with either of the major political parties, such as the Democratic or Republican parties. Independent voters often value their autonomy and may prioritize issues or candidates over party loyalty. They can play a significant role in elections, particularly in closely contested races, as they can swing either way depending on their preferences for candidates or policies, rather than being bound by party ideology.

Other choices such as "registered voter" refer to any individual who has officially signed up to vote, regardless of their party affiliation; "partisan voter" describes someone who strongly aligns with a specific political party; and "active voter" indicates a person who regularly participates in elections but does not specify their party affiliation. The uniqueness of "independent voter" is what distinguishes it as the correct answer for this question.