This is the 2996th most frequent Japanese word.
ハーフ
"ハーフ" refers to a person of mixed heritage, typically half Japanese and half another ethnicity.
In this sentence, ハーフ refers to a person of mixed origin or heritage, specifically expressing the mix between Japanese and French.
彼女は日本人とフランス人のハーフです。
She is half Japanese and half French.
Here, ハーフ is used to mean one half of a whole, applied to sharing an item, in this case, a cake.
このケーキのハーフを私にくれませんか?
Could you give me half of this cake?
In this sentence, ハーフ refers to half the distance of a standard marathon, commonly used in sports to denote partial distances.