Gender: the socially constructed roles, behaviours, activities, and attributes that a given society considers appropriate for men and women.
Women used to be considered to unimportant to educate. Then they were considered too uneducated and fluffy to vote (giving a woman the vote would be like giving her husband two votes).
They were considered irresponsible with money, so their husband, or a male member of the family had to sign the loan agreement or mortgage.
Children would be the property of their husband, no matter what.
In my lifetime, quite recently, pub landlords were perfectly entitled to refuse to serve women, on the basis that they were female.
Until 1992 rape within marriage was completely legal. Since your wife was your property.
Women have, variously and recently, been thought of as property, crap with money, stupid, unenlightened, there for sex on demand, and completely unimportant.
That's 'gender'.
The socially constructed roles, behaviours, activities, and attributes that a given society considers appropriate for men and women.
And now it's being used to shut down their voice, sport, spaces, representation and rights.