It might be a duplicate, but I can't find one with my short searching.
I found the two sentences with different meaning of "due"
- I had to abandon my project due to a lack of government funding.
- He is due to start school in this March.
As a foreigner, I learned the first 'due' means, with 'due to', 'because of', or kind of meaning cause and effect (exactly, effect and cause). But, I think second 'due', in most other cases, means 'the necessity of doing something' or 'it plans to'.
I can't understand why 1st meaning comes from 2nd meaning. Is it just a word with multiple meaning? Or, does 'due' have something special links between them, related with a preposition 'to'?