Used mainly in mathematics to describe repeated addition of the same number. In 3x5, 'multiplication' gives us 15 by repeating addition of 3, five times.
Pro Tip 2/3
Not Just Numbers
Can refer to increasing things that can be counted, but not necessarily numbers. Multiplication of efforts can increase the success rate of a project.
Pro Tip 3/3
Used with 'Times'
Often paired with 'times' to indicate the number of repetitions in math. We learned that '4 times 4' means 'multiplication of 4 by itself'.