The term 'Pivotal Line' refers to a line that is of great importance or significance. The crossword solutions for this term are AXIS and SEAN. AXIS is a straight line about which a body rotates, or the center around which something is organized. SEAN is a male given name derived from the Hebrew name Yohanan, meaning 'God is gracious'. Together, these two words represent the idea of a line that is essential to the structure or organization of something.