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• n  the quality of something that continues without end or interruption

• After 20 years, Mary Byrne, teacher at the model school of the New York Training School for Teachers, began to fear the incessancy of this schoolteacher's routine.
• After 20 years, Mary Byrne, teacher at the model school of the New York Training School for Teachers, began to fear the incessancy of this schoolteacher's routine.

• continuousness
• ceaselessness
• incessantness