This is the 1422nd most frequent Chinese word.
丁
"Ding" (丁) refers to a person, population, a fourth in sequences (like a list), or the smallest cube-shaped piece in cooking.
In this sentence, '丁' refers to a 'member,' specifically a male member of a family.
李家有一位男丁,十分勇敢。
The Li family has one male member who is very brave.
Here, '丁' refers to 'level' or 'degree,' indicating the medium level of heat.
煮饭时火要快调成中等的丁。
When cooking, the heat should quickly be adjusted to medium intensity.
Here, '丁' refers to 'small pieces' or 'cubes,' describing the shape into which the food should be diced.