Definition from Wiktionary, the free dictionary
- (transitive) To turn (something) upside down or inside out; to place in a contrary order or direction.
- to invert a cup, the order of words, rules of justice, etc.
- That doth invert the attest of eyes and ears, / As if these organs had deceptious functions.
- Such reasoning falls like an inverted cone, / Wanting its proper base to stand upon.
- (transitive, music) To move (the root note of a chord) up or down an octave, resulting in a change in pitch.
- (chemistry, intransitive) To undergo inversion, as sugar.
- To divert; to convert to a wrong use.
- (Can we find and add a quotation of Knolles to this entry?)
turn upside down or inside out
move (the root note of a chord) up or down an octave
invert (plural inverts)
- (archaic) A homosexual person.
- (architecture) An inverted arch (as in a sewer). *
- The base of a tunnel on which the road or railway may be laid and used when construction is through unstable ground. It may be flat or form a continuous curve with the tunnel arch. 
- (civil engineering) The lowest point inside a pipe at a certain point.
- (civil engineering) An elevation of a pipe at a certain point along the pipe.
- A skateboarding trick where the skater grabs the board and plants a hand on the coping so as to balance upside-down on the lip of a ramp.
- (biology, informal) invertebrate
homosexual — see homosexual
architecture: inverted arch
engineering: lowest point inside pipe
engineering: elevation of pipe
invert (not comparable)
- (chemistry) Subjected to the process of inversion; inverted; converted.
- invert sugar
- ^ invert (in'‑vert) The floor or bottom of the internal cross section of a closed conduit, such as an aqueduct, tunnel, or drain - The term originally referred to the inverted arch used to form the bottom of a masonry‑lined sewer or tunnel (Jackson, 1997) Wilson, W.E., Moore, J.E., (2003) Glossary of Hydrology, Berlin: Springer