Based on the hint provided, it appears you are looking for the definition associated with the term "Line of Symmetry." This is a line that a figure in the plane has if the figure can be mapped onto itself by a reflection in the line.
Here are some other definitions for the terms you listed:
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Reflection: A transformation that flips a figure over a line, creating a mirror image.
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Rotation: A transformation that turns a figure around a fixed point by a certain angle.
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Transformation: A general term for operations that change the position, size, or shape of a figure.
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Dilation: A transformation that alters the size of a figure while maintaining its shape, using a scale factor.
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Pre Image: The original figure prior to a transformation.
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Image: The resulting figure after a transformation has been applied.
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Shrink: A type of dilation that reduces the size of a figure.
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Degree of Rotation: The measure of the angle through which a figure is rotated.
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Clockwise: A direction of rotation that is the same as the movement of the hands of a clock.
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Scale Factor: A number that scales, or multiplies, the dimensions of a figure in a dilation.
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Translation: A transformation that moves every point of a figure a constant distance in a specified direction.
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Enlargement/Expansion: A type of dilation that increases the size of a figure.
If you'd like to confirm or need to clarify specific definitions or match them to the correct terms, please let me know!