1794, "an appendix to a work; a thing to be added," literally "something added," from Latin addendum, neuter of addendus "that which is to be added," gerundive of addere "add to, join, attach" (see add (v.)). Classical plural form is addenda.
adapter
adaptive
adays
add
added
addendum
adder
addict
addicted
addiction
addictive
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