spell-n; 4 Senses

Sense Number 1: a mental state of being mesmerized, enchanted by something

Commentary: SPELL[+state][+psychological][+mesmerized]

The singer had the audience under her spell as she delivered the sultry tunes.
I was still under the spell of the film's breathtaking ending as I left the theater.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: a magical incantation believed to have powers

Commentary: SPELL[+event][+speech_act][+incantation][+with_power][+magical]

The sorcerer cast a spell over the princess and turned her into a swan.
The witch gave him an amulet to ward off evil spells.

WordNet 3.0 Sense Numbers: 4

Sense Number 3: an indefinite span of time of some activity

Commentary: SPELL[+span][+temporal][+indeterminate]

They sat for a spell on the front porch and smoked their pipes.
We had a spell of bad weather last month.
Mary's recent spells of gardening have really improved the looks of her yard.

WordNet 3.0 Sense Numbers: 2, 3

Sense Number 4: an attack of a medical affliction

Commentary: SPELL[+event][+attack][+of_affliction][+medical]
NOTE: a narrow medical usage of Sense 3

Grandma is having one of her spells again, better call the doctor.
The patient described his spells of dizziness.

WordNet 0.0 Sense Numbers: 1c