1
a
: a small particle of a burning substance thrown out by a body in combustion or remaining when combustion is nearly completed
b
: a hot glowing particle struck from a larger mass
especially
: one heated by friction
2
a
: a luminous disruptive electrical discharge of very short duration between two conductors separated by a gas (such as air)
b
: the discharge in a spark plug
c
: the mechanism controlling the discharge in a spark plug
4
: something that sets off a sudden force
provided the spark that helped the team to rally
5
: a latent particle capable of growth or developing : germ
still retains a spark of decency
6
sparks plural in form but singular in construction
: a radio operator on a ship
sparked; sparking; sparks
1
a
: to throw out sparks
b
: to flash or fall like sparks
2
: to produce sparks
specifically
: to have the electric ignition working
3
: to respond with enthusiasm
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Merriam-Webster unabridged
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