That depends upon the context of your question.
Mathematically speaking you can have as many dimensions as you want, and work with them; so a 14-dimensional vector space is possible in mathematics and can be worked with.
But mathematics is also used to model the world:
Zero dimensions is a point
One dimension is a line
Two dimensions are a plane
Three dimensions forming length, width and depth form the space we live in.
Einstein extended the three dimensional space in Relativity by considering time as a fourth dimension creating a space-time model to explain things like gravity.
More recently there have been attempts to unify the different theories about how gravity, quantum effects, nuclear forces, etc work. As a result the three dimensions has been expanded by String Theory to many more dimensions. For example Super string theory has 10 dimensions and Bosonic string theory has 26. Supergravity theory has an upper limit of (and preference for) 11 dimensions, whilst general gravity theory allows any number of dimensions (including 14).
As is, many answers are possible. If the rectangle is a square, the dimensions are 14 x 14.
The volume of a suitcase with the dimensions of 15 inches x 14 inches x 11 inches is 2310 inches3.
The question cannot be answered because the units for 14 * 14 are not known. 14 mm * 14 mm? 14 miles * 14 miles? or 14 light years * 14 light years. Even if they were, it would not be possible to give a sensible answer to the question. 14*14 is a measure of area, with dimensions [L2]. An inch is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As far as I know (and I see many) the standard dimensions are 14 x 48, 14 x 56, 14 x 62, and 14 x 68. I have seen a few longer, but don't see them as 'standard'
Mathew 14:
14" wheel
14' square
It means, 8 1/2 feet by 14 feet.
The dimensions of the rectangle are 3 inches by 14 inches
The standard dimensions for a toilet can vary depending on the country you live in. The American standard is either 14 or 15 inches.
Just multiply the dimensions given: 14*14*24 = 4704 cubic feet
The dimensions of the rectangle will then work out as 14 cm by 10 cm because the perimeter is 14+10+14+10 = 48 cm