A time period of indeterminate length, generally more than one year
A person's lifetime
(hyperbolic) A very long time
Plural for the period of light between sunrise and sunset
“Although we worked hard during the day, we made up for it in the evenings with a hearty meal and many drinks.”
Plural for the most active or successful period of a person's life or career
“Although he has since been mostly forgotten, Smith was a very prominent astronomer in his day.”
Plural for a particular period of the past
“He had a reputation for inspiring lectures, inherited from the most eminent moral philosopher of his day.”
Plural for each of the twenty-four-hour periods, reckoned from one midnight to the next
“Tomorrow is the first day of another month, and I intend to make some significant resolutions for February.”
Plural for a given date
“On what day do you plan to leave this place?”
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