Estimate without measurement is a term used to describe the process of making an educated GUESS about something without taking any measurements. It is often used in situations where it is not possible or practical to measure something, such as when estimating the number of people in a crowd or the amount of time it will take to complete a task. The crossword solution for this term is 'GUESS, ' which is a five-letter word that accurately describes the process of estimating without measurement.