det

• (in combinations such as 'as much', 'this much') Used to indicate, demonstrate or compare the quantity of something.
  "Add this much water and no more."
• (now archaic or nonstandard) A great number of; many (people).
  "ye shall not nede to seke hym soo ferre sayd the Kynge / for as I here saye sir Launcelot will abyde me and yow in the Ioyous gard / and moche peple draweth vnto hym as I here saye"
• (now Caribbean, African-American, UK regional) many ( + plural countable noun).
  "They got so much things to say right now, they got so much things to say."

adj

• (obsolete) Large, great.
  "Thenne launcelot vnbarred the dore / and with his lyfte hand he held it open a lytel / so that but one man myghte come in attones / and soo there came strydyng a good knyghte a moche man and large / and his name was Colgreuaunce / of Gore / and he with a swerd strake at syr launcelot myȝtely and he put asyde the stroke"
• (obsolete) Long in duration.

adv

• To a great extent.
  "He is much fatter than I remember him."
• (in combinations such as 'as much', 'this much') Used to indicate or compare extent.
  "I don't like Wagner as much as I like Mozart."
• (slang) Combining with an adjective or (occasionally) a noun, used in a rhetorical question to mock someone for having the specified quality.
  "Jamie's always preaching about how we need to save a planet when she drives literally everywhere she goes. Like, hypocritical much?"
• (obsolete) Almost.