Movements may arise from structural deformation, or may be induced by temperature variations or changes in moisture content.
Many theories on punishment exist, all of which are variations on a theme. A variation is a change or slight difference in a level, amount, or quantity. Every day without variation my grandfather ate a plate of cold ham. Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers.
Noun variation (usually uncountable, plural variations) The act of varying; a partial change in the form, position, state, or qualities of a thing.
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In this case, in English Euro (or euro) has two accepted plural forms: euros and euro. In Community legislative acts the plural forms of euro and cent are spelled without the s, notwithstanding normal English usage. Otherwise, normal English plurals are recommended and used; with many local variations such as 'centime' in France. Wikipedia