/ ˌmɑːdʒɪˈneɪliə; NAmE ˌmɑːrdʒ-/ noun [ pl. ]
1.
notes written in the margins of a book, etc.
2.
facts or details that are not very important
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WORD ORIGIN
mid 19th cent.: from medieval Latin , neuter plural of marginalis , from margo , margin- edge.