Fall

Fall has several meanings:

Fall is the more common North American word for the season usually known as autumn in British English.
A freefall or other downward movement, often followed by a collision with the ground, due to gathering speed by weight. It is the result of dropping something, jumping, or an accident in which a person or object is no longer supported, e.g something rolls or slides off a table, one loses control over one's legs or bicycle, etc.
A shortened form of the word waterfall, more typically "falls" than just "fall" (such as "we're hiking up to the falls today"). These often occur around the fall line, where the piedmont drops to the coastal plain.
A fall is the sudden arrival of large numbers of migrating birds on an island or at a coastal headland due to drift migration.
The Fall is the Christian doctrine of man's rebellion against his creator God, bringing God's condemnation on himself, as described in the story of Adam and Eve.