n 1  :  a characteristic and fairly uniform concentration of a constituent of the blood or other body fluid <a normal blood-sugar >   2 a  :  a degree of ability or aptitude or measure of performance  b  :  a grade of mental and emotional development or maturity <evidence as to s of personality development (e.g., anal, oral) -G. P. Murdock>  .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.