Questions & Answers about Термін дії короткий.
Literally, it is something like term of action/effect.
In real usage, термін дії means the period during which something is valid or in force. You will often see it with things like:
- паспорт = passport
- віза = visa
- договір = contract
- ліцензія = license
So it is a normal administrative phrase for validity period.
Because дії is the genitive singular form of дія.
Ukrainian often uses the pattern:
noun + genitive noun = the X of Y
So here:
- термін = term, period
- дії = of validity / of operation / of effect
You can think of it as answering the question:
- термін чого? = the term of what?
- дії = of validity/effect
This is a very common structure in Ukrainian.