Wordinian.com - Wordinian

Noun: Desc; The word for a word that has whole words within itself -
all the way from 1 letter up to the length of the word.

(Word-in-[ian])

An example: The word "stage"

STAGE

1 letter word A - ( s t a g e )

2 letter word TA - ( s t a g e )

3 letter word AGE - ( s t a g e )

4 letter word STAG - ( s t a g e )

5 letter word STAGE - ( s t a g e )

From a short word like "bin" to a longer word like "strangers", a wordinian word can be any length

Notes:

 - Longer wordinian words are scarce

- all wordinian words seem to have either an "a" or "i" within the word

- the words within a wordinian must be complete and unbroken

- strangely... all the "within" words are often also wordinian words

What is the longest English word you can find that is a Wordinian?