Some common synonyms of expand are amplify, dilate, distend, inflate, and swell. While all these words mean "to increase in size or volume," expand may apply regardless of the manner of increase (such as growth, unfolding, addition of parts).

"Expand" and "extend" both mean to make larger, but "expand" suggests making something spread out or taking up more space, while "extend" suggests making something longer or increasing its range or reach. They are largely interchangeable in most cases, but "expand" is slightly more common and considered more versatile.

An expanded definition, also called an extended definition, is a paragraph or composition explaining a complex or abstract term. Expanded definitions are frequently used to explain new technology or economic, medical, legal, or social terms.

It means that the expansion of numbers is based on the place value. The expanded form splits the number, and it represents the number in units, tens, hundreds and thousands form. For example, the expanded form of the number 1572 is 1000+500+70+2.