A lengthy lecture on a subject; a treatise; a discourse; a sermon.
A formal exposition of a subject, especially a research paper that students write in order to complete the requirements for a doctoral degree in the US and a non-doctoral degree in the UK; a thesis.
A story; a spiel.
A splinter; a strip of wood or metal.
A game.
To talk at length, to spiel.
To run.
To climb.
To lake, play, sport, take amusement.