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a. a period of history marked by some feature or characteristic; era
b. (capital when part of a name): the Middle Ages; the Space Age
2. Geology palaeontol
a. a period of the earth's history distinguished by special characteristics
b. the period during which a stage of rock strata is formed; a subdivision of an epoch
3. Myth any of the successive periods in the legendary history of man, which were, according to Hesiod, the golden, silver, bronze, heroic, and iron ages
4. Psychol the level in years that a person has reached in any area of development, such as mental or emotional, compared with the normal level for his chronological age
5. of age adult and legally responsible for one's actions (usually at 18 or, formerly, 21 years)



in humans, a stage of development that is characterized by specific regularities of formation of the organism and personality and by relatively stable morphophysiological and psychological traits. While age is a stage in the biological maturing of the organism, a process controlled by genetic factors, it is also a concrete result and stage of the social-psychological development of the personality and is determined by the conditions of life, training, and upbringing.

The content and form of training and upbringing are historically composed and varied according to age; in their turn they affect the determination of the boundaries and possibilities of a given age. In contemporary pedagogy and developmental psychology, several ages are differentiated with respect to the known relationships of the boundaries: infancy (from birth to one year); pre-preschool, or early childhood (from one to three); preschool (from three to seven); early school age (from seven to ten years); juvenile, or middle school (from ten to 15); and late school, or early youth (15 to 18 years old). Beyond these limits there is no generally accepted classification in the literature; only old age is considered separately. With the increased longevity noted in the 20th century, gerontology and gerontopsychology have arisen as disciplines to study the problems of prolonging the active life of a human being. Each age has a characteristic structure of cognitive, emotional, and volitional properties and qualities; forms of behavior; types of relationships to the environment; and peculiarities of structure and functioning of various organs and systems of the organism. This structure, however, is not invariable: in the 20th century a general acceleration of the physical and mental development of children has been noted. On the other hand, educational theory, in solving the problem of optimizing training, widens the possibilities of age and the boundaries of acquiring knowledge. Training must take into account not only the level of development achieved but also the development perspectives (the concept of “zones of imminent development,” as formulated by L. S. Vygotskii): the teacher must know not only what is present in a child of a given age but also what can be achieved, given certain conditions, by the child in the near future.



Period of time from origin or birth to a later time designated or understood; length of existence.
Any one of the named epochs in the history of the earth marked by specific phases of physical conditions or organic evolution, such as the Age of Mammals.
One of the smaller subdivisions of the epoch as geologic time, corresponding to the stage or the formation, such as the Lockport Age in the Niagara Epoch.


(aerospace engineering)
References in periodicals archive ?
stress degree and starvation duration), feeding/or diet and slaughter age between the studies.
Bone fragments suitable for determining the slaughter ages of horses were also too few.
The kits were weighed at weaning and at 82 days (slaughter age) and the following traits were determined: weaning weight, final weight and daily feed intake, daily weight gain, feed conversion rate and survival rate from weaning until the slaughter age.
Higher HCD in bulls from M16 treatment may be explained by their lower slaughter age (16 months) in comparison to the slaughter age of bulls from M22 (22 months).
The reduction in the slaughter age of beef cattle by using appropriate strategies of feeding in the different phases of life results in the improvement of meat quality, particularly in the tenderness (VAZ; RESTLE, 2003), as well as in higher proportion of carcass muscle (MULLER; PRIMO, 1986).
Rising stock values must not be accompanied by exactly proportionate increases in cost so attention must be paid, if it is not being done already, to basic post-decoupling management adjustments which will include significant reduction to slaughter age, producing more calves per 100 cows and housing cows for significantly shorter periods in winter.
Thus, there are 8 month--difference in slaughter age between bulls and steers.
Another important factor to be considered is that chicken performance and carcass characteristics are mainly influenced by sex, breed and slaughter age (BILGILI et al.
MLC beef scientist Mary Browne said: "Average carcase weights varied widely at any given slaughter age, with large proportions weighing under 250kg and over 300kg at every age.
Effects of slaughter age on meat tenderness and USDA carcass maturity scores of beef females.