The correct abbreviation depends on the context. Addl is military, Addnl is US Government as seen in law writing, and Addtl is used in legal context such as a home mortgage.
The abbreviation usually used is Add'l, with or without the apostrophe (on legends addl. using the period).
Do not use this in formal text as the word and the abbreviation create confusion. The intended purpose is for military, government, or legal writing. For example writing a legal document with extreme repetition or for drawings, legends, or postscripts that are intended for a specialized audience.
add'l is the most popular way to abbreviate "additional"
However, according to All Acronyms there some alternatives like "adl", "addn" or "Addl" in specific industries.
http://www.allacronyms.com/additional/abbreviated
The abbreviation usually used is Add'l, with or without the apostrophe. This is not used in formal text, but only for drawings, legends, or postscripts.
the answer would be ext. (i am 99.9%) positive.
Extra's Abbreviation: EC, EXT
Other Helpful Abbreviations:
Example: EX
Etcetera: Etc.
addt'l
add'l
Abbreviation
WITH in abbreviation is w/.
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The accepted abbreviation for the word "additional" is "addl."
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