Noun

seed (countable and uncountable; plural seeds)

(countable) A fertilized grain, initially encased in a fruit, which may grow into a mature plant.
If you plant a seed in the spring, you may have a pleasant surprise in the autumn.
(countable, botany) A fertilized ovule, containing an embryonic plant.
(uncountable) An amount of fertilized grain that cannot be readily counted.
The entire field was covered with geese eating the freshly sown seed.
(uncountable) Semen.
Sometimes a man may feel encouraged to spread his seed before he settles down to raise a family.
(countable) A precursor.
The seed of an idea. Which idea was the seed (idea)?
(countable) The initial state, condition or position of a changing, growing or developing process; the ultimate precusor in a defined chain of precusors.

The initial position of a competitor or team in a tournament. (seed position)
The team with the best regular season record receives the top seed in the conference tournament.
The competitor or team occupying a given seed. (seed position)
The rookie was a surprising top seed.
Initialization state of a pseudorandom number generator (PRNG). (seed number)
If you use the same seed you will get exactly the same pattern of numbers.
Commercial message in a creative format placed on relevant sites on the Internet. (seed idea or seed message)
The latest seed has attracted a lot of users in our online community.