Cluster Meaning. A coronavirus cluster occurs when there is a concentration of infections in the same area at the same time. US military a metal insignia worn on a medal ribbon to indicate a second award or a higher class of a decoration or order.
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Entry 1 of 2. Cluster1 ˈklʌstə -ər noun countable 1. A number of similar things that occur together.
A cluster of people or things is a small group of them close together.
The 16 clusters are as follows. A group of similar things that are close together sometimes surrounding something. A group of. A cluster of grapes.