(1) Achievement of full development or growth. (2) Developmental changes that lead to maturity. (3) Processing of a macromolecule, e.g., posttranscriptional modification of RNA or posttranslational modification of proteins. (4) The overall process leading to the incorporation of a viral genome into a capsid and the development of a complete virion. [L. maturatio, a ripening, fr. maturus, ripe]