The word appears 1 times.
Apparently Hemingway just could not resist using the word once in this novel. It's funny that various editions of this novel were censored to remove words like "shit", "fuck" and "cocksucker", but this was left alone. Kinda tells you what people once wanted to censor. Now, I would imagine, it might be the other way around.
"I went fishing with the barman."
"Wasn't it fun?"
"Yes."
"Don't think about me when I'm not here."
"That's the way I worked it at the front. But there was something to do then."
"Othello with his occupation gone," she teased.
"Othello was a nigger," I said. "Besides, I'm not jealous. I'm just so in love with you that there isn't anything else."