13-Letter Words Matching ____C__I_____

There are 16 13-letter words that match ____C__I_____. 5 are common words, such as EFFICACIOUSLY and IMPECUNIOUSLY. A rarer one is UNRECLAIMABLE. In this set, I is the most frequent open letter (15 words). 4 words contain a doubled letter.

Full list 16

efficaciouslyimpecuniouslyindoctrinatedindoctrinatesirreclaimableantichristianillocutionaryimpecuniosityindoctrinatorsemicivilizeddomiciliatingdomiciliationirreclaimablyovercivilizedundoctrinaireunreclaimable

About this list

Words
16 (5 common words)
Common example
efficaciously
Rare example
unreclaimable
Doubled letters
4
Ending in S
1
Most frequent letter
I (15)

Questions

How many 13-letter words matching ____c__i_____ are there?

16. 5 of them are common words.

What is a common example?

EFFICACIOUSLY is among the common words in this set.