prep. = ON. ° Upon is sometimes more formal, and is preferred in once upon a time and upon my word, and in uses such as row upon row of seats and Christmas is almost upon us.
[ ME f. UP + ON prep., after ON upp ]
prep. = ON. ° Upon is sometimes more formal, and is preferred in once upon a time and upon my word, and in uses such as row upon row of seats and Christmas is almost upon us.
[ ME f. UP + ON prep., after ON upp ]
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012