The difference between Availability and Unavailability
When used as nouns, availability means the quality of being available, whereas unavailability means the state of being unavailable.
check bellow for the other definitions of Availability and Unavailability
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Availability as a noun (chiefly, uncountable):
The quality of being available.
Examples:
"What is your availability this week?"
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Availability as a noun (countable):
That which is available.
Examples:
"We have several availabilities."
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Unavailability as a noun:
The state of being unavailable