1st dimension- a length.
2nd dimension- length & width.
3rd dimension- length, width & height.
4th dimension- length, width & height and a constant duration. so length width & height are in a continuous time frame.
5th dimension- 4th dimension, except it folds into itself and can move from any point to another.
6th dimension- 5th dimension, except when folded anything existing inside can travel backwards in time, no duration limits apply.

An animation depicting the 4 dimensions. Line, Square, Cube, Tesseract.