abilitude

Perhaps a blend of ability + aptitude.

• IPA^(key): /əˈbɪl.ə.tjuːd/, /əˈbɪl.ɪ.tjuːd/

abilitude (uncountable)

1. (rare) ability, capacity; aptitude, competence
   • 1912 August 22nd–29th, Alfred R. Orage, “The New Age” in Political and Economic Writings (1977), page 18

     When it is remembered that Mrs. Pankhurst and her daughters…were members of the Labour movement before they were Suffragists, their abilitude in the Labour vocabulary is natural.

   • 2004 September 10th, John Lucas, alt.music.michael-jackson, “Re: Repost for the benefit of those who missed it the first time – Idiot John Lucas”, message 19

     All of this pointless discussion…was just a simple exercise for me to display…my…abilitude to show inarguable facts in the face of bluffery.