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Synonyms for Append (same or very similar meaning)

WordNet sense 1 (add to the very end):
affix, supplement, affix, add on

WordNet sense 2 (fix to; attach):
tack, hang on, tack on, tag on

WordNet sense 3 (state or say further):
add, supply, supply

From the ODE community, based on WordNetadd/edit