Word: 成年 (chéngnián) 成年 dictionary entry chéngnián to grow to adulthood; fully grown; the whole year Full dictionary entry for 成年 Example sentences using 成年 2 sentences, showing page 1 of 1. 他儿子明年就成年了。 Tā érzi míngnián jiù chéngnián le. His son will be an adult next year. 成年的大熊猫有多重？ Chéngnián de dàxióngmāo yǒu duōchóng? How much does a full-grown panda weigh?