When you're talking about more than one, you're talking about multiple things. A machine with many fixtures has multiple parts. A person that seems like two totally different people on different days might have multiple personalities.

The word multiple comes from the Latin multiplus meaning "manifold." When something exists in multiple forms, it's manifold, or has many kinds. Think of a multiplex theater that can show multiple movies at once. Walk through a garden full of flowers and you'll see multiple kinds of blooms. A multiple is also a number that can be divided into another number without a remainder. Multiples of five, for example are ten, fifteen, twenty... — you get the picture.

Definitions of multiple
  1. adjective
    having or involving or consisting of more than one part or entity or individual
    multiple birth”
    multiple ownership”
    “made multiple copies of the speech”
    “his multiple achievements in public life”
    “her multiple personalities”
    “a pineapple is a multiple fruit”
    composed of a dense cluster of separate units such as carpels or florets or drupelets
    occurring in pairs
    consisting of two (units or components or elements or terms)
    double, doubled, two-fold, twofold
    twice as great or many
    double, dual, duple
    consisting of or involving two parts or components usually in pairs
    double, dual, three-fold, threefold, treble, two-fold, twofold
    having more than one decidedly dissimilar aspects or qualities
    (used technically of a device or process) having two parts
    manifold, multiplex
    many and varied; having many features or forms
    ternary, treble, triple, triplex
    having three units or components or elements
    three-fold, threefold, treble, triple
    three times as great or many
    being three in one; used especially of the Christian Trinity
    four-fold, fourfold, quadruple
    four times as great or many
    four-fold, fourfold, quadruple, quadruplex, quadruplicate
    having four units or components
    quaternary, quaternate
    consisting of or especially arranged in sets of four
    five-fold, fivefold, quintuple
    having five units or components
    sextuple, six-fold, sixfold
    having six units or components
    septuple, seven-fold, sevenfold
    having seven units or components
    eight-fold, eightfold, octuple
    having eight units or components
    nine-fold, ninefold, nonuple
    having nine units or components
    denary, ten-fold, tenfold
    containing ten or ten parts
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    existing alone or consisting of one entity or part or aspect or individual
    azygos, azygous
    occurring singly; not one of a pair
    one-man, one-person, one-woman
    designed for or restricted to a single person
    lone, lonesome, only, sole, solitary
    being the only one; single and isolated from others
    singular, unique
    the single one of its kind
    sui generis
    constituting a class of its own; unique
    consisting of or involving a single element or component
    one-member, uninominal
    based on the system of having only one member from each district (as of a legislature)
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  2. noun
    the product of a quantity by an integer
    “36 is a multiple of 9”
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    a quantity that is twice as great as another
    a quantity that is three times as great as another
    a quantity that is four times as great as another
    lcm, least common multiple, lowest common multiple
    the smallest multiple that is exactly divisible by every member of a set of numbers
    type of:
    mathematical product, product
    a quantity obtained by multiplication
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