The crossword solutions for the term TITLE FOR ISAAC NEWTON are SIR, which is an abbreviation for the honorific title of 'SIR'. This title is typically used in the United Kingdom and other Commonwealth realms to denote a knight or baronet, and is usually given to individuals who have been recognized for their outstanding achievements. Isaac Newton was an English physicist, mathematician, astronomer, natural philosopher, alchemist, and theologian who is widely recognized as one of the most influential scientists of all time. He was knighted by Queen Anne in 1705 and thus became SIR Isaac Newton.