Real Dictionary

F.O.R. in American English
abbreviation: free on rails: delivered to a railway station and loaded onto a train without charge to the buyer

f.o.r. in British English
abbreviation for: free on rail

for
preposition: If something is for someone, they are intended to have it or benefit from it.
preposition: If you work or do a job for someone, you are employed by them.

for in American English
preposition: with the object or purpose of

for in American English 1
in place of; instead of

for in American English 2
foreign

for in British English
preposition: intended to reach; directed or belonging to

for- in American English
away, apart, off
prefix: a prefix meaning “away,” “off,” “to the uttermost,” “extremely,” “wrongly,” or imparting a negative or privative force, occurring in verbs and nouns formed from verbs of Old or Middle English origin, many of which are now obsolete or archaic

for- in British English
prefix: indicating rejection or prohibition

for. in American English
abbreviation: foreign
abbreviation: Forester