Learn how to say Expansions correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word expansion:
an expanding or being expanded; enlargement; dilation
an expanded thing or part
the amount, degree, or extent of expansion
a development or full treatment, as of a topic
the process or result of working out or giving the full form of a contraction, equation, etc.
(mechanics) the expanding in volume of steam in the cylinder of a steam engine after cutoff, or of gas in the cylinder of an internal-combustion engine after explosion