a central depository where things can be left or picked up(noun.artifact)
source: wordnet30
the act of dropping something(noun.act)
Example: They expected the drop would be successful.
source: wordnet30
The quantity of fluid which falls in one small spherical mass; a liquid globule; a minim; hence, also, the smallest easily measured portion of a fluid; a small quantity; as, a drop of water.(noun)