In the definition, Merriam-Webster mentions that groups of females comprise “made up of usually adult members of the female sex: consisting of females” [Emphasis added].
“Woman” is defined in the dictionary as “an adult female person.”
The dictionary also includes an entry specifically for “gender identity”: “a person's internal sense of being male, female, some combination of male and female, or neither male nor female.”
The definition of “woman” has been a controversial political issue and during recent Congressional hearings. The Washington Times reported:
During a Senate committee hearing on abortion policy last week, University of California Berkeley law professor Khiara Bridges had a sharp exchange with Sen. Josh Hawley, Missouri Republican, over her use of the phrase “people with the capacity for pregnancy.”
When Mr. Hawley asked Ms. Bridges if she was referring to women, Ms. Bridges said that some women can’t get pregnant, just as there are some transgender men and nonbinary people who can get pregnant.
Today’s dictionary evolved from the iconic A Compendious Dictionary of the English Language, published by Daniel Webster in 1806 — “the first truly American dictionary.”
Webster's dictionary website explains Webster's goals:
Born in West Hartford, Connecticut in 1758, Noah Webster came of age during the American Revolution and was a strong advocate of the Constitutional Convention. He believed fervently in the developing cultural independence of the United States, a chief part of which was to be a distinctive American language with its own idiom, pronunciation, and style.