Incorrect singular and plural for addendum and addenda

[robertmylne]

Using Laravel for this, but it uses Inflector under the hood.

> Str::plural('addendum')
= "addendums" // should be `addenda`

> Str::singular('addenda')                                                                                                                                                                                 
= "addenda" // should be `addendum`

[malarzm]

addendums is correct pluralization according to https://en.wiktionary.org/wiki/addendum

[garrettw]

@malarzm Wiktionary lists both as valid. This is one of those weird cases where the true Latin form has largely fallen out of favor, so -ums may indeed be the preferred plural form now. (Another weird case like this is "data" -- where we don't commonly use the true Latin singular form "datum" anymore.)

[robertmylne]

Well you would have to go with the one that people use the most in the real world, which is addenda, for most people addendums seems incorrect.

Google graphs the usage of words in literature, and you can see the comparison here: https://books.google.com/ngrams/graph?content=addenda%2Caddendums&year_start=1800&year_end=2019&corpus=en-2019&smoothing=3