Plural form of embarkation; multiple instances of boarding vehicles or multiple boarding locations.
From embarkation + the standard English plural suffix '-s'. This is a straightforward regular plural of the '-ation' noun.
The regularity of English plurals after '-ation' nouns (situations, relations, embarkations) makes them predictable, but historical documents often use creative spellings like 'embarkations' and 'embarquations' interchangeably, showing language in flux.
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