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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)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


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)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
At 3 months of corrected age, babies whose head circumference is less than 1st centile consisted of 44.4% of ELBW babies and 55.6% of VLBW babies.
At 12 months of corrected age, babies whose head circumference is less than 1st centile consisted of 54.5% of ELBW babies and 45.5% of VLBW babies.
30 (31.91%) babies had abnormal NSG at term corrected age. The above data is presented in Table 1(c).
Of the total 94 infants followed up at corrected age of 9 to 15 months, 40 infants had sepsis and 54 infants were without sepsis as control group.
The distributions of SE, astigmatism, and biometric findings at the corrected age of 3 years in the ROP patients treated with either ranibizumab or bevacizumab are shown in Figure 1.
In the comparison of refractive outcomes and biometric parameters in the two treatment groups, we found no differences regarding SE or astigmatism between the two groups at the corrected age of 3 years.
In a study by den Boer and Schipper [21] it was observed that at 9 months of corrected age, posture balance presented difficulties in 17% of preterm infants compared to 2% of full-term infants.
Feeding and drinking skills in preterm and low birth weight infants compared to full term infants al a corrected age of nine months.
There was a significant correlation between the result of the final examination at 2 years corrected age and the Amiel-Tison examination and the frequency of evaluations ([chi square]=339.3, p<0.01).
In follow-up sessions conducted by a pediatric physiotherapist after discharge up to three months' corrected age, a combined/mixed evaluation approach was followed, both of the classical "synactive" type and of the "ecological-transactional" type (i.e., based on the observation of the development of a functional use of motor skills, of the infant-parent interaction, and of the behavioural modulation).
For example, if data were collected on infants at the 6-month assessment period, the infants would need to be within 6 months + 4 weeks corrected age.
The height, weight and head circumference percentiles of each subjects were calculated according to the corrected age and recorded and the corrected age was calculated using the formula: current age--(40 --gestational week).