The Chinese word for "Full moon" is written as "满月 (mǎn yuè)". The first Chinese character "满 (mǎn)" describes something that is enriched, fulfilled completely, equal to "full" here. And the second character is easy to understand as the Chinese name of the moon. For example, the moon is not only called as a word "月亮 (yuè liàng)" but can also be represented by a single character as "月 (yuè)".

And then, the full moon is not just named "满月 (mǎn yuè)" but also called "圆月 (yuán yuè)", in which the character "圆 (yuán)" contains meanings of a full and round shape. For this reason, the night of the full moon got popular in China from the ancient by its name of "月圆之夜 (yuè yuán zhī yè)", indicating the night when the moon has already got round fully.

Since the full moon usually appears on the fifteenth day around in each lunar month, according to the astronomical observation records by ancient Chinese, each 15th day of a month in the Chinese lunar calendar was defined as "望月 (wàng yuè)", indicating the day worth gazing at the full moon.  Here the Chinese character "望 (wàng)" has the right meaning to look up or gaze at something in distance. For example, one of the most famous fifteenth day falling in the lunar eighth month is well known as China's "Mid-Autumn's Day" or the "Mid-Autumn Festival" written as "中秋节 (zhōng qiū jié)" in Simplified Chinese.

However, please be fully careful with the Chinese word "满月 (mǎn yuè)" since it may has a completely different meaning in the context, probably referring to a popular Chinese local custom and etiquette, instead of the relationship with the astronomical phenomenon. When a baby's first 30th day after birth has already come, the parents will take it as the most important thing to the family. They usually hold a "One-Month-Old" celebration in China and invite families as well as friends together, in order to wish their new family member a healthy body, great fortune, and full of joy in life. Such a "one-month-old" celebration for new-born babies is called "满月 (mǎn yuè)" in Chinese because the word literally tells that it has been one month already.