Usage Note
Raggruppare means to bring separate things or people into a group: raggruppare i dati per categoria ('to group data by category'). The reflexive raggrupparsi means 'to gather, to cluster together'. It takes avere as auxiliary. Note the double p, which lengthens the consonant: rahg-groop-PAH-reh. The noun is raggruppamento (grouping, cluster).
Examples
"Dobbiamo raggruppare le parole per tema."
Natural Translation
We need to group the words by theme.

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