As per title really. There seems to be an increasing number of threads where the OP talks about their DC going to "school" so responders naturally assume that the child is at "school" for 9-3 type hours, is at least age 4 and goes there every day. Only for the OP to reveal later that their DC is only 2/3 and actually goes to nursery/pre-school which quite often fundamentally changes the answers.
When and why did this change in terminology happen?