1. In electroencephalography, the presence of neurogenic electrical energy.
2. In physical chemistry, an ideal concentration for which the law of mass action will apply perfectly; the ratio of the activity to the true concentration is 3. For enzymes, the amount of substrate consumed (or product formed) in a given time under given conditions; turnover number.
blocking activity
insulin-like activity
intrinsic sympathomimetic activity
nonsuppressible insulin-like activity
optical activity
plasma renin activity
specific activity
triggered activity