What are job redundancies? Is this an idiom?

[alphonse elric]

Test No. errors/advan-2 "Please, remind me", question 5

After about an one hour the director appeared and announced that there would be no redundancies.

(a) an one hour
(b) appeared
(c) would
(d) redundancies

Test No. errors/advan-2 "Please, remind me", answer 5

After about an hour the director appeared and announced that there would be no redundancies.

Correct entry: an hour
The error was: (a) an one hour
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How can you say 1 hour in another way,and what does "redundancies" mean?

[Alan]

You can either say after one hour or after an hour but not both at the same time.

If you lose your job, you are made redundant, which means you are no longer needed. When a business or company has to reduce the number of its staff, people are made redundant and the word for jobs lost is redundancies.
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English as a Second Language
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