What is the difference b/w the uses of conjunctions- till and uptill?

There is a very thin line of difference between the usage of 'till' and 'until' which can be explained here as: Until is used in proper English and 'till' came out as a shortened version of the same. Until is the more common of the two words and is generally considered to be slightly more formal, which is why it turns up more often in edited prose. It is also rather more likely to appear at the beginning of a sentence than is till. But till is perfectly good English and the choice of whether to use it or until is often decided by the rhythm of the sentence