1. adverb /ɔːlˈməʊst,ˈɔːl.məʊst,ˈɔl.moʊst,ˈɑɫ.moʊst/
a) Very close
b) Not quite
2. adjective /ɔːlˈməʊst,ˈɔːl.məʊst,ˈɔl.moʊst,ˈɑɫ.moʊst/
Similar to
They could be almost brothers.
3. noun /ɔːlˈməʊst,ˈɔːl.məʊst,ˈɔl.moʊst,ˈɑɫ.moʊst/
Something or someone that doesnt quite make it.
In all the submissions, they found four papers that were clearly worth publishing and another dozen almosts.
Wikipedia foundation.