An informal or affectionate word for grandmother, used mostly by children and families.
From reduplication of 'na' or 'nan,' a childish sound for grandmother. Similar forms exist in many languages (Spanish 'nana,' Italian 'nonna'), suggesting children independently created this sound worldwide.
Almost every culture independently invented the word 'nana' or something similar for grandmother—it's one of humanity's most universal baby-words, which tells us that grandmothers have been loved by grandchildren across all of history!
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