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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 ?
The risk of large for gestational age across increasing categories of pregnancy glycaemia.
Comparison of groups with APO and normal outcome failed to reveal differences in the regard of maternal age, gestational age, placental width, and maternal and fetal surface areas.
The study demonstrated that the rate of abortion was reduced in women treated with progesterone, irrespective of their gestational age.
KEY WORDS: birth weight, cohort, gestational age, greenness, green space, head circumference, INMA, NDVI, pregnancy outcomes, reproductive health.
Table 3 includes the birth weight values associated with the 50th percentile (median) for male and female Peel infants at each gestational age (between 31 to 42 weeks) for each maternal region of birth.
Lipkind, MD, MS, assistant professor of Maternal Fetal Medicine at Yale School of Medicine, the researchers reviewed birth certificate and hospital discharge information for 2,560 small for gestational age babies who were delivered preterm.
The gestational age was confirmed by ultrasonography in the first trimester in 191 (85.
11] Persson also commented that gestational age estimated using by bi-parietal diameter gave the best reliability, with a standard deviation from true gestational age of 3.
Lohr PA, Reeves MF and Creinin MD, A comparison of transabdominal and transvaginal ultrasonography for determination of gestational age and clinical outcomes in women undergoing early medical abortion, Contraception, 2010, 81(3):240-244.
There was no correlation between gestational age and kisspeptin concentration in amniotic fluid (P = 0.
A detailed tabulation of the BPD at various gestational age is given at results and discussion section.
A cohort of 246 women with singleton uncomplicated pregnancies and early ultrasound-confirmed gestational age was recruited from the community antenatal clinics in the Tygerberg area (Elsies River, Bishop Lavis, Bellville South, Delft and Belhar).