An instance of such usage; a roundabout expression, whether an inadvisable one or a necessary one.
Unnecessary use of extra words to express an idea, such as a pleonastic phrase (sometimes driven by an attempt at emphatic clarity) or a wordy substitution (the latter driven by euphemistic intent, pedagogic intent, or sometimes loquaciousness alone).
Necessary use of a phrase to circumvent either a vocabulary fault (of speaker or listener) or a lexical gap, either monolingually or in translation.
A twist or fold.
One 360° turn in a spring or similar helix.
A mathematical operation on two functions that produces a third that expresses how the shape of one is modified by the other; the integral of the product of the two functions after one is reflected about the y-axis and shifted along the x-axis.
The shape of something rotating; a vortex.
Any of the folds on the surface of the brain.
The state or condition of being convoluted.
A function which maps a tuple of sequences into a sequence of tuples.