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Beginning; (noun) late 12th century, "time when something begins", from begin, meaning "act of starting something" from early 13th century. Originally from the Old English "fruma". "Ab initio" is the Latin for "from the beginning" from 1600.c, from "initium" meaning "entrance, beginning", which is related to "inire" (verb) for "to go into, enter upon, begin".

Start; (noun) "a sudden movement" from late 14th century, from the verb start meaning the "act of beginning to build a house" originating from 1946. The use as an "opportunity at the beginning of a career or course of action" is from 1849. The phrase "false start" is believed to be from 1850.

Middle; (adjective) from Old English "middel", from the West Germanic "middila" which can be traced back to "medjaz". "Middle name" is back to 1815, as "one's outstanding characteristic", colloquial from 1911, American English.  "Middle-of-the-road", the figurative sense, is based from 1894, and "middle finger" from 1000.c.

Progression; (noun), meaning "action of moving from one condition to another" from the late 14th century and is taken from Old French , "progression" and is directly linked to "progressionem" from Latin for "a going forward, advancement, growth, increase" from the past participle of "progredi" for "go forward". This is taken from "pro", "forward and "gradi", "to step, walk". ("gradi" is from "gradus" for "step".)

Ending; (noun) "a coming to an end" from Old English "endunge", the verbal noun from "end".

Over; (prep) from Old English "ofer" for "beyond, above, upon, in, across, past; on high", which is from Proto-Germanic "uberi". As an adjective from Old English "uffera", and as an adverb from late Old English. The use in the sense of "finished" is derived from the late 14th century, as the meaning "recovered from" is from 1929. The phrase "over-the-counter" is attested to 1875, originally used for stocks and shares.