| appearance | 1. The act of appearing or coming into sight; the act of becoming visible to the eye; as, his sudden appearance surprised me. 2. A thing seed; a phenomenon; a phase; an apparition; as, an appearance in the sky. 3. Personal presence; exhibition of the person; look; aspect; mien. "And now am come to see . . . It thy appearance answer loud report." (Milton) 4. Semblance, or apparent likeness; external show. Outward signs, or circumstances, fitted to make a particular impression or to determine the judgment as to the character of a person or a thing, an act or a state; as, appearances are against him. " There was upon the tabernacle, as it were, the appearance of fire." (Num. Ix. 15) "For man looketh on the outward appearance." (1 Sam. Xvi. 7) "Judge not according to the appearance." (John. Vii. 24) 5. The act of appearing in a particular place, or in society, a company, or any proceedings; a coming before the public in a particular character; as, a person makes his appearance as an historian, an artist, or an orator. "Will he now retire, After appearance, and again prolong Our expectation?" (Milton) 6. Probability; likelihood. "There is that which hath no appearance." (Bacon) 7. The coming into court of either of the parties; the being present in court; the coming into court of a party summoned in an action, either by himself or by his attorney, expressed by a formal entry by the proper officer to that effect; the act or proceeding by which a party proceeded against places himself before the court, and submits to its jurisdiction. To put in an appearance, to be present; to appear in person. To save appearances, to preserve a fair outward show. Synonym: Coming, arrival, presence, semblance, pretense, air, look, manner, mien, figure, aspect. Origin: F. Apparence, L. Apparentia, fr. Apparere. See Appear. Source: Websters Dictionary (01 Mar 1998) |
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| absolute intensity threshold acuity | The minimal light that can be seen. (05 Mar 2000) |
| absolute threshold | The lowest limit of any perception whatever. Compare: differential threshold. Synonym: stimulus threshold. (05 Mar 2000) |
| achromatic threshold | Threshold of visual sensation, the minimal light intensity evoking a visual sensation. Synonym: achromatic threshold, minimum light threshold. (05 Mar 2000) |
| anaerobic threshold | The oxygen consumption level above which aerobic energy production is supplemented by anaerobic mechanisms during exercise, resulting in a sustained increase in lactate concentration and metabolic acidosis. The anaerobic threshold is affected by factors that modify oxygen delivery to the tissues; it is low in patients with heart disease. Methods of measurement include direct measure of lactate concentration, direct measurement of bicarbonate concentration, and gas exchange measurements. (12 Dec 1998) |
| auditory threshold | The audibility limit of discriminating sound intensity and pitch. (12 Dec 1998) |
| brightness difference threshold | The smallest difference that can be perceived as a difference in brightness. Synonym: light difference. (05 Mar 2000) |
| pain threshold | Amount of stimulation required before the sensation of pain is experienced. (12 Dec 1998) |
| galvanic threshold | The minimal strength of an electrical stimulus of indefinite duration that is able to cause excitation of a tissue, e.g., muscle or nerve. See: chronaxie. Synonym: galvanic threshold. Origin: rheo-+ G. Basis, a base (05 Mar 2000) |
| relational threshold | The smallest degree of difference between two stimuli that permits them to be perceived as different. (05 Mar 2000) |
| visual threshold | Threshold of visual sensation, the minimal light intensity evoking a visual sensation. Synonym: achromatic threshold, minimum light threshold. (05 Mar 2000) |
| renal threshold | Concentration of plasma substance above which the substance appears in the urine. (05 Mar 2000) |
| phenotypic threshold | A quantitative genetic trait with a continuous distribution termed its liability may generate two kinds of phenotype, according to whether the liability lies above or below some critical threshold at about which a radical change in behaviour occurs. For instance, blood uric acid level is a liability with an approximately gaussian distribution. At a critical point of chemical saturation (the threshold crystallization occurs and the resulting gout or nongout is a threshold trait. (05 Mar 2000) |
| minimum light threshold | Threshold of visual sensation, the minimal light intensity evoking a visual sensation. Synonym: achromatic threshold, minimum light threshold. (05 Mar 2000) |
| convulsant threshold | The smallest amount of stimulation, electric current, or drug required to induce a convulsion. (05 Mar 2000) |