the GNU version of the Collaborative International Dictionary of English
n. The quality of being half; incompleteness.
The Century Dictionary and Cyclopedia
n. The character of being a half or an incomplete state of something; the state of not being a whole or of being partial; incompleteness; imperfection.
Word Usage
"Without a turn such as that, and without the additional work of extending that bit of language into a larger dramatic whole, the anecdote amounts to little more than a clever but trivial riff on “halfness.”"