today-n; 2 Senses

Sense Number 1: present age

Commentary: Timespan including the present that is typically larger than the current twenty four hour period.

The world of today demands tougher hairspray.
Today we have computers to facilitate communication with clients.

WordNet 2.0 Sense Numbers: 1

Sense Number 2: this 24hr day

Commentary: The the twenty four hour time period that includes the present

It's a beautiful day, today.
Did you see today's paper.
No, yesterday doesn't count - today I start my diet.

WordNet 2.0 Sense Numbers: 2