Also, they are dependent of simultaneously present static magnetic or electric fields and their polarization.

The three ligands must be present simultaneously for reduction to occur.

It can be more difficult to determine whether in a particular case all four elements referred to are simultaneously present:

In an ideally structured species, these two quite different attitudes would be present simultaneously in the same individual.

Multiple causes can be present simultaneously in one person.

There are several conditions that must be simultaneously present for so-called "spontaneous combustion" to occur.

Various times, places and selves are simultaneously present throughout the novel.

(Some states do not require all parties to be present simultaneously.)

As a frequent rider, I have a hard time remembering a ride in which all three conditions were simultaneously present.

I have observed something of this sort in human minds frequently; two opposite emotions simultaneously present.