Expansion is what happens when something becomes bigger or more extensive. If you enjoy good pastry, you will be excited by the expansion of the bakery, but be careful or you will also see the expansion of your waistline.

The noun expansion is from the Latin word expansionem, which means a spreading out. Another definition for expansion is an elaboration or expanding upon something. If you're a teacher, you might be asked to give an expansion of the short talk you give students, "Homework Stinks: But Why We Need It Anyway" to parents at the school open house.

Definitions of expansion
  1. noun
    the act of increasing (something) in size or volume or quantity or scope
    synonyms: enlargement
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    the act of decreasing (something) in size or volume or quantity or scope
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    dilatation, dilation
    the act of expanding an aperture
    distension, distention
    the act of expanding by pressure from within
    act of expanding by lengthening or widening
    the act of filling something with air
    the act of expanding something in apparent size
    act of expanding in scope; making more widely available
    dilation of blood vessels (especially the arteries)
    the action of stretching something tight
    spread, spreading
    act of extending over a wider scope or expanse of space or time
    act of stretching or straightening out a flexed limb
    extension to or beyond the ordinary limit
    reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs
    type of:
    increase, step-up
    the act of increasing something
  2. noun
    adding information or detail
    synonyms: expanding upon
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    amplification, elaboration
    addition of extra material or illustration or clarifying detail
    annotating, annotation
    the act of adding notes
    subjoining, subjunction, supplementation
    the act of supplementing
    type of:
    increase, step-up
    the act of increasing something
  3. noun
    a discussion that provides additional information
    synonyms: elaboration, enlargement
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    a discussion (spoken or written) that enlarges on a topic or theme at length or in detail
    embellishment, embroidery
    elaboration of an interpretation by the use of decorative (sometimes fictitious) detail
    type of:
    discourse, discussion, treatment
    an extended communication (often interactive) dealing with some particular topic
  4. noun
    a function expressed as a sum or product of terms
    “the expansion of (a+b)^2 is a^2 + 2ab + b^2”
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    type of:
    function, map, mapping, mathematical function, single-valued function
    (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)
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