Before people get pissed at me for asking a question that has likely been asked more than a few times, I just want to know a simple answer, if first dimension is that an object exists, (collision) Second dimension is flat, (that there is color and reflection to it) and 3rd dimension is depth, would fourth dimension be perception of time, or simply perspective (seeing at a specific angle) or can it be both?
Dimensions in physics generally means degrees of freedom. That is how many different directions can you move something.
For example on a straight line you can move back and forth in one direction, so we say the line has just one dimension. The same is true for a curve.
On a table-top we can move in two independent directions so we say that this is 2d. The same is true for the surface of a sphere.
In space, we can move in three different directions, so we say that it is 3d.
Sometimes time is said to be the 4th dimension, but note we can only move along it in just one direction and the way we move is fixed; so in this sense, it's not really a dimension.
Mathematically, all of the above is modelled by the notion of a manifold, which we say is of dimension n when locally we can always move in n different dimensions.
Despite what I said about time, usually spacetime, after Einstein and especially after Minkowski, we model spacetime as a 4d manifold.
Yours isn't a physics question. Since this is a physics forum however I'll answer in physics terms.
In physics, one dimension means a straight line. You only need one coordinate to specify it - for example with the horizontal axis, you only need to know how many units a point is before or after the origin to know where it is. Two dimensions is a plane. In the x-y plane, you need to know both the x-coordinate and the y-coordinate to know unambiguously where a point is. Three dimensions is the world we're familiar with. You not only need to know the x-coordinate and the y-coordinate, you also need to know how high a point is above the plane.
Time is the 4th dimension in Relativity, and it's related to the other three dimensions but has a minus sign. In Minkowski space (Special Relativity), the metric is:
$ds^2 = -dt^2 + dx^2 + dy^2 + dz^2$
Here $t$ is time, and $x, y, z$ are spatial coordinates. If you don't recognize this formula don't worry about it, but the point is that these things are being added. This isn't always possible - adding time to energy for example makes no sense. The fact that we can add these means that we can treat time and space on an equal footing. However they're also not equivalent - there's a minus sign between the two that no sleight-of-hand could ever conjure away.
There're ongoing searches for more spatial dimensions, and some theories such as string theory predict there are 10 spatial dimensions, but nothing has been found yet.