Activity: Recreational or leisure in nature. Generally fun and less physically and psychologically challenging. Not usually inducing a consistent overload to the muscles or a training effect to the cardiovascular system, though do provide some forms of physical fitness benefits. Often sport oriented.

 

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Activity: Recreational or leisure in nature. Generally fun and less physically and psychologically challenging. Not usually inducing a consistent overload to the muscles or a training effect to the ca . . . View Full Definition

Activity Coefficient: (gamma) The ratio of activity to concentration; a = gamma c where a, gamma, and c are the activity, activity coefficient, and concentrations, respectively. Activity coefficients are usually . . . View Full Definition

Quantitative Structure-Activity Relationship: A mathematical connection between chemical structure and biological activity, established by statistical analysis or pattern recognition techniques.

Attention Deficit Hyperactivity Disorder (ADHD): A lifelong developmental disability (with onset in infancy, childhood or adolescence) that involves problems with attention span, impulse control, and activity level at home, at school or at . . . View Full Definition

Asset Activity Ratios: Ratios that measure how effectively the firm is managing its assets.

Interactivity: If your web site isn't interactive, it's dead.

Hydrothermal Activity: Any process involving high-temperature groundwaters, especially the alteration and emplacement of minerals and the formation of hot springs and geysers.

Radioactivity: Spontaneous emission of particles or high-energy electromagnetic radiation from the nuclei of unstable atoms. 'Radiation' refers to the emissions, and 'radioactive source' refers to the sour . . . View Full Definition

Passive Activity Loss (PAL): A loss incurred in participating in passive investing.

Optical Activity: A substance that is capable of rotating plane-polarized light. Molecules of an optically active substance cannot be superimposed on their own mirror images, just as your left hand cannot be . . . View Full Definition