The word "coherent" means logically connected. It implies that there is a clear and logical connection between different ideas or parts of something. In the given options, the word "coherent" is the only one that accurately represents this meaning. The other options, such as "inequality in age, rank, or degree" or "laziness; inactivity; dullness," do not convey the same idea of logical connection. Therefore, the correct answer is "logically connected."