Final answer:
Predestination is the term associated with Calvin's belief that salvation or is predetermined by God at birth, impacting Calvinists' daily lives as they looked for signs of being among the elect.
Step-by-step explanation:
The word associated with John Calvin's idea that God had already decided which people would be saved is predestination. Calvin's theology argues that from the moment of birth, individuals are predestined to be either saved or , without any actions in life being able to change this predetermined fate. Calvinists, therefore, searched for signs in their actions and way of life that might indicate they were among the 'elect', reflecting the doctrine's profound impact on their daily conduct and perception of salvation.