A macrocycle is, as defined by IUPAC, "a cyclic macromolecule or a macromolecular cyclic portion of a molecule." In the chemical literature, organic chemists may consider any molecule containing a ring of seven, fifteen, or any arbitrarily large number of atoms to be macrocyclic. Generally however, when speaking of macrocycles, coordination chemists define a macrocycle as a cyclic molecule with three or more potential donor atoms in a ring of at least nine atoms.

Macronutrients Malabsorption

a long stretch of training which is intended to accomplish an extremely important overall goal, such as the preparation for and completion of a very important marathon

an entire training cycle (for bodybuilders, an entire year)

a training period (or season) consisting of the 3 periods (Preparatory, Competitive and Transition)

a developmental period of considerable length directed towards peaking at maximum performance fitness