Matt black vs Flat black?

Sorry, this must seem like a dumb question to some.. but:
What is the difference between flat black and matt black?

definitions I have found so far:
matt (also spelled matte): French mat, from Old French, faded, defeated
: lacking or deprived of luster or gloss: as a : having a usually smooth even surface free from shine or highlights <matte metals> <a matte finish> b : having a rough or granular surface
flat: hrm, of all the online dictionaries I have tried, no definitions fit. So.. my own: A surface that does not reflect light well due to it being uneven.

So far I'm guessing that:
flat looks flat yet is 'bumpy'
matt looks flat but is smooth?

Very muddled here... Thanks for any clarifications beforehand.

Steve

if you ask me flat=matt as gloss=shiny or am I the dumb one? :D

Flat and Matt are same thing

different brands different labels.
as far as i know, only tamiya use the term "flat"; i mean, i don't recall them having a "matte" paint in their acrylic range.

tamiya has a matt black in spray cans

tamiya has a matt black in spray cans
Yeah.. that's where I noticed it... that's why I got so confused...

thanks for the reply guys.

Steve

testors has flat, and matte in their model master line of enamels. from what I can tell, the MATTE has a super dull finish that doesn't reflect at all, where the flat is just a bit more dull than semi gloss. this is from personal experience using the model master paints, and model master airbrush enamel thinner mixed approximately 3 parts paint to 1 part thinner, or thinned to the consistency of whole milk.

Its the same thing,regardless of differences between brands.