This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To add at the end; append.

v. To add something to the end; to append or annex

v. To add after something else has been said or written; to ANNEX.

To add at the end of, especially of something said or written; annex; append: as, to subjoin an argument or an illustration.

Synonyms To affix, attach.

v. add to the end

"For the purpose of mutual understanding, I give you a copy below of the note which I found, (through my engagement as to sending the monthly parcel to Troston) I was bound to send to Mr Lofft a few days past; and I subjoin a few remarks on the preface which I have this minute read attentively."

subjoined    subjoining    subjoins   

append    tack on    tag on    hang on    tack   

subjoinder   

unite    annex    join    add    attach   

liii    multivitamin    repeller    addendum