HiFi vs MidFi


I’m a relative noob to the audiophile scene, having just invested in an integrated amp and upscale (for me) speakers.  From time to time, I hear the term “MidFi” for some components.  Is there an objective or just largely accepted definition for this term?  I’d be curious to hear feedback on what constitutes HiFi vs. MidFi across various components.  
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HIFI is defiantly different than MidFi.  I lived with MidFi for years good but never great.  Once you lived with HIFI you know the difference.  I relate it to once you've see a photo taken with a superior lens the clarity and depth and colors are so much improved you can then on instantly tell an inferior photo when previously you hadn't noticed the flaws.   The same goes with HIFI once you experience it you'll know the difference.
mahgister, not doubting your claims re totality of listening experience,  but surely you would agree that some components achieve better resolution than others, that some move more air than others, and that these differences are audible?
mahgister, not doubting your claims re totality of listening experience, but surely you would agree that some components achieve better resolution than others, that some move more air than others, and that these differences are audible?
Yes you are completely right....There is a difference between A Sansui Amplifier of the golden Era and many other amplifier not so well designed for example...

My point is ONLY that acoustic control and treatment, if they NEVER coud replace the NECESSITY for  good designed produts by themselves, will anyway by themselves give you this 50 % of the S.Q. that NO GEAR could do by itself alone....( This % is a "metaphor" conveying my message not a measurable fact but this % mirror my own experience )

Acoustic is the queen and the working gear are the 7 little working dwarves...