The difference between Cis-trans isomerism and Geometric isomerism
When used as nouns, cis-trans isomerism means a form of geometric isomerism in which one isomer has the cis- and the other has the trans- configuration, whereas geometric isomerism means a form of isomerism in which, in one isomer two atoms or groups are on the same side of the plane of a double bond or ring, whereas in the other isomer they are on opposite sides.
check bellow for the other definitions of Cis-trans isomerism and Geometric isomerism
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Cis-trans isomerism as a noun (chemistry):
a form of geometric isomerism in which one isomer has the cis- and the other has the trans- configuration
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Geometric isomerism as a noun (chemistry, dated, [[deprecated]] by [[IUPAC]]):
A form of isomerism in which, in one isomer two atoms or groups are on the same side of the plane of a double bond or ring, whereas in the other isomer they are on opposite sides; these are cis- and trans- isomers, respectively.