fiat. 1  an authoritative decree, sanction, or order: a royal fiat. Synonyms: authorization, directive, ruling, mandate, diktat, ukase. 2  a fixed form of words containing the word fiat, by which a person in authority gives sanction, or authorization.
Definitions for heartiness. Here are all the possible meanings and translations of the word heartiness. Princeton's WordNet(0.00 / 0 votes)Rate this definition: vigor, vigour, dynamism, heartiness(noun) active strength of body or mind. heartiness, wholeheartedness(noun) the quality of hearty sincerity.
Contractility is the inherent strength and vigour of the heart's contraction during systole. According to Starling's Law, the heart will eject a greater stroke volume at greater filling pressures. For any filling pressure (LAP), the stroke volume will be greater if the contractility of the heart is greater.