What is a synonym for with?

There isn't one single perfect synonym for "with," as its meaning can change depending on the context. Here are some options, depending on the intended meaning:

For accompaniment or company:

* along with

* together with

* in company with

* accompanied by

For possession or association:

* having

* possessing

* equipped with

For means or instrument:

* by means of

* using

* employing

* through

For agreement or concurrence:

* in agreement with

* in accord with

* in support of

For cause or reason:

* due to

* because of

* owing to

For opposition or contrast:

* against

* despite

* in spite of

For connection or relation:

* related to

* connected to

* associated with

The best synonym to use will depend on the specific sentence and the intended meaning.