The best replacement for maturation is learning.

The best alternatives to maturation are rated as following:
★★★★★  learning
★★  development
★  late maturation
★  differentiation
  maturity

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Speaking about maturation, one probably shouldn't forget about development.

Other search terms related to maturation and their ratings are:
★★★★★ development
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Google Trends

Scale is based on the average worldwide traffic of maturation in all years. Click on graph for more.
maturation
learning
development