The term 'GREAT ZEAL' can be broken down into two words, 'GREAT' and 'ZEAL'. The word 'GREAT' is an adjective that means 'remarkable in magnitude, degree, or extent'. The word 'ZEAL' is a noun that means 'enthusiastic diligence; eagerness; fervor'. Together, the phrase 'GREAT ZEAL' can be interpreted to mean 'a remarkable degree of enthusiasm and eagerness'. The crossword solution for this term is 'ARDOR', which is a noun that means 'intense and passionate feeling'. Therefore, the phrase 'GREAT ZEAL' can be defined as an intense and passionate feeling of enthusiasm and eagerness.