This is the 73rd most frequent Japanese word.
分
"分" means "minute," "portion," or "part" in English.
分 is used to indicate an extent or degree to which something applies.
この問題はすぐに解ける分難しくない。
This problem is not difficult to the extent that it can be solved quickly.
分 is used to mean 'portion' or 'share' in this context.
私の分も用意してくれました。
They prepared my portion as well.
分 is used to represent a causal reason or factor in this usage.