I dunno if yall have already seen this or not, but in case you haven't, MAC's website explains it as:
LIPSTICK FINISHES
AMPLIFIED CRÈME
Ultra-creamy. Quietly shiny. Colour-packed! Hi-res: hi-impact.
FROST
Excellent colour payoff with medium to high frosted shimmer-and-shine finish.
GLAZE
Low-colour impact with sheen-style finish. Glazes the lips, makes them shine!
LIP TREATMENT
Colour-free. Texture-free. Provides natural healthy-looking lips.
LUSTRE
Demi-sheer with wet-look lustre finish. Very slick. Makes lips look soft, smooth, ultra-moist.
MATTE
Pigment rich with intense colour pay-off. No-shine, all matte finish.
SATIN
Colour-rich. Soft satin, semi-matte finish. Conditions while adding intense colour.
SHEER
Colour-light with sheer, near-translucent, naturally-tinted finish.