The term 2, 4, 6, 8, etc. is a sequence of numbers known as even numbers. Even numbers are integers that can be divided by two without leaving a remainder. This sequence of numbers is an example of a mathematical pattern known as an arithmetic progression, where each number in the sequence is obtained by adding a fixed number to the previous number. The crossword solution for this term is 'EVENS', which is a five-letter word that refers to the even numbers in the sequence.