A committer is an individual who is able to modify the source code of a particular piece of open-source software. To contribute source code on most large projects, one must make modifications and then "commit" those changes to a central repository such as Git (or CVS). To have "a commit bit" on one's user account means that one is permitted to commit those changes. This dates to the use of a literal binary digit to represent yes-or-no privileges in many software systems.[citation needed]

The Commit bit is permission to contribute to a shared source code for a software project.

Common roles
Project committers are usually the lead developers of a project and usually are the ones responsible for the majority of changes and as such are seen as trusted members of the community.

Relatedly, committers are usually responsible for the review of patches submitted members of the community for inclusion into the software. After a successful review, usually consisting of conformance to coding standards and ensuring it does not introduce any new bugs, the committer will commit that specific patch on behalf of the patch submitter.

https://en.wikipedia.org/wiki/Committer

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Note added at 4 horas (2019-09-25 16:33:20 GMT)
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Thanks. A new one for me too.

https://en.wikipedia.org/wiki/Committer