A transformation is a dramatic change in form or appearance. An important event like getting your driver’s license, going to college, or getting married can cause a transformation in your life.

A transformation is an extreme, radical change. A simple haircut won't cause a transformation in your appearance, but if you dyed your hair purple and got a tattoo across your forehead, that would be another story. When a transformation occurs, we often use the phrase "undergo a transformation" in reference to the person or thing who has changed. So, if you do opt for the new hair color and tattoo, you will certainly have "undergone a transformation."

Definitions of transformation
  1. noun
    the act of changing in form or shape or appearance
    synonyms: translation
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    complete change in character or condition
    alteration, revision
    the act of revising or altering (involving reconsideration and modification)
    the act of transforming so as to exalt or glorify
    the act of changing into a different form or appearance (especially a fantastic or grotesque one)
    a complete change of physical form or substance especially as by magic or witchcraft
    distraction, misdirection
    the act of distracting; drawing someone's attention away from something
    the act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect)
    the act of modifying or changing the strength of some idea
    reorganisation, reorganization
    an extensive alteration of the structure of a corporation or government
    metamorphosis, transfiguration
    a striking change in appearance or character or circumstances
    type of:
    change of integrity
    the act of changing the unity or wholeness of something
  2. noun
    (genetics) modification of a cell or bacterium by the uptake and incorporation of exogenous DNA
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    type of:
    change of integrity
    the act of changing the unity or wholeness of something
  3. noun
    a qualitative change
    synonyms: shift, transmutation
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    advance, betterment, improvement
    a change for the better; progress in development
    population shift
    a change in the relative numbers of the different groups of individuals making up a population
    transformation of a substance produced by the action of heat
    sea change
    a profound transformation
    (chemistry) a change directly from the solid to the gaseous state without becoming liquid
    tin disease, tin pest, tin plague
    the transformation of ordinary white tin into powdery grey tin at very cold temperatures
    changeover, conversion, transition
    an event that results in a transformation
    degeneration, retrogression
    passing from a more complex to a simpler biological form
    becoming stronger
    becoming weaker
    renaissance, resurgence, revitalisation, revitalization, revival, revivification
    bringing again into activity and prominence
    debilitation, enervation, enfeeblement, exhaustion
    serious weakening and loss of energy
    elaboration, refinement
    the result of improving something
    accommodation, adjustment, fitting
    making or becoming suitable; adjusting to circumstances
    the conversion of glucose to glycogen when the glucose in the blood exceeds the demand
    isomerisation, isomerization
    the conversion of a compound into an isomer of itself
    the conversion of alternating current to direct current
    conservation, preservation
    an occurrence of improvement by virtue of preventing loss or injury or other change
    return to an original state
    atrophy, withering
    any weakening or degeneration (especially through lack of use)
    attenuation, fading
    weakening in force or intensity
    downfall, fall
    a sudden decline in strength or number or importance
    a loss of vitality and a degeneration of cells and tissues not due to any apparent injury
    (biology) degenerative reversion of cells or tissue to a less differentiated or more primitive form
    loosening, relaxation, slackening
    an occurrence of control or strength weakening
    type of:
    alteration, change, modification
    an event that occurs when something passes from one state or phase to another
  4. noun
    (mathematics) a function that changes the position or direction of the axes of a coordinate system
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    (mathematics) a transformation in which the direction of one axis is reversed
    (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin
    (mathematics) a transformation in which the origin of the coordinate system is moved to another position but the direction of each axis remains the same
    affine transformation
    (mathematics) a transformation that is a combination of single transformations such as translation or rotation or reflection on an axis
    (mathematics) a transformation that changes the size of a figure but not its shape
    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)
  5. noun
    a rule describing the conversion of one syntactic structure into another related syntactic structure
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    type of:
    grammatical rule, rule of grammar
    a linguistic rule for the syntax of grammatical utterances
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