(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
"In organic chemistry, the hydroxyl group determines whether an alcohol will react differently than an alkane."
a set that is closed, associative, has an identity element and every element has an inverse
"When studying abstract algebra, we often prove theorems by showing that any given collection of numbers forms a group under addition or multiplication."
A number of things or persons being in some relation to one another.
"The migrating birds formed a loose group as they flew south together for the winter."
In plain English: A group is a collection of people or things that are together because they share something in common.
"The group of friends decided to meet at the park for lunch."
Usage: Use "group" to refer to a collection of people or items that are gathered together and share a common purpose or connection. Avoid using it for random assortments without any unifying factor.
To put together to form a group.
"The teacher asked us to group ourselves by birthday so we could play team games."
In plain English: To group means to put things or people together into a single category or team.
"The teacher asked the students to group themselves into pairs for the activity."
Usage: Use the verb group when you arrange separate items or people into a single cluster based on shared characteristics. Avoid using it loosely to mean simply gathering without any logical connection between the elements.
The word "group" comes from the French groupe, which originally meant a cluster or heap. In mathematics, the term was adopted in 1830 to describe Évariste Galois's theory of groups.