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There are dozens of synonyms and shades of meaning, but the main are:

1) to plan or to intend to do something (=to be going to)
Я не собираюсь это обсуждать = I'm not going to discuss it

2) to...

She is getting married next week.
She will have heart surgery next month.
She is going to study Russian in the spring.

Она выходит замуж на следующей неделе.
В следующем месяце ей сделают...