What term refers to "attainment or progression of a skill or capacity to function" such as the ability to walk during late infancy?

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Development refers to the process of acquiring new skills or abilities, such as the ability to walk during late infancy. Growth refers to physical changes in size or mass. Maturation refers to the biological process of becoming fully developed, including physical, cognitive, and emotional development. Senescence refers to the decline in physical and mental functioning that occurs with aging.

What Term Refers to "Attainment or Progression of a Skill