adolescence | The period from the onset of puberty until the attainment of adulthood, about ages twelve to twenty. 282, 317
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cognitive | Relating to knowing, including both awareness and judgment. 320
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gynecomastia | Swollen breasts in a male. 318
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psychosexual | Pertaining to the emotional or mental aspects of sexuality. 315
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puberty | The earlier portion of adolescence, during which a person becomes functionally capable of reproduction. 282, 317
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sex play | Activities more physically sexual than kissing but stopping short of vaginal intercourse or orgasm; also called making out or petting. 323
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spermarche | A boy's first ejaculation. 283, 317
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