The first meaning of دیگر digar is ‘(the) other’:

آن کتاب دیگر را می‌خواهم
ān ketāb digar rā mi xāham
“I want the/that other book.”

The other meaning of this particle is ‘any more, no more’ when dealing with a negative principal verb:

In addition, this particle can have other syntactic functions in a sentence. It is the same as the English ‘already’ in the following construction:

!دیگر بس است
digar bas ast!
“Enough already!” (colloquial)

!دیگه بسّه
dige basse!
“Enough already!”(colloquial)

Or sometimes:

!بسّه دیگه
basse dige!
“Enough already!”(colloquial)

It also means “else” as in the following:

دیگر چه؟
digar ce
‘What else?’ (colloquial)

دیگه چی؟
dige ci?
‘What else?’ (colloquial)

It also means ‘another (thing),’ ‘something else’:

چیز دیگری می‌خواهید؟
ciz-e digari mi xāhid?
“Do you want another thing?”, i.e., “Anything else?”

چیز دیگری نمی‌خواهید؟
ciz-e digari nami xāhid?
‘Don’t you want another thing?’
‘Don’t you want anything else?’

Sometimes, with positive verbs, it is used with هم ham as a segment:

چیز دیگری هم می‌خواهید؟
ciz-e digari ham mi xāhid?
“Do you want another thing/something else?”, still, “Anything else?”.

A plural form of digar is دیگران digarān means ‘others = the other people’:

دیگران هم این کار را کرده‌اند
digarān ham in kār rā karde-and
“Others have done this too,” or “The other people have done this too.”