Definition: the day that includes the present moment (as opposed to yesterday or tomorrow)
Usage: Today is beautiful; did you see today's newspaper?
Definition: time for Earth to make a complete rotation on its axis
Usage: two days later they left; they put on two performances every day; there are 30,000 passengers per day
Definition: the present time or age
Usage: the world of today; today we have computers
Definition: the period of time that is happening now; any continuous stretch of time including the moment of speech
Usage: that is enough for the present; he lives in the present with no thought of tomorrow