1) Breeding 1) Giving rise to 2) The source of something 3) Video game terminology 
the production or depositing of large quantities of eggs in water.
[video gaming] In video games, spawning is the live creation of a character or item. Respawning is the recreation of an entity after its death or destruction. All players typically spawn at the start of a round, whereas some objects may spawn after the occurrence of a particular event or delay. A player spawning again in the same round will...
• (p. pr. & vb. n.) of Spawn
(from the article `cephalopod`) ...the female individually fixing the eggs singly or in festoons by a short stalk or thread. In loliginids the eggs in fingerlike capsules often form ... In sexual reproduction, eggs (up to several million) from females and spermatozoa from males are shed into the water (spawning), where the eggs are ... ...
the release or deposition of spermatozoa or ova, of which some will fertilize or be fertilized to produce offspring; fish reproduction process characterized by females and males depositing eggs and sperm into the water simultaneously or in succession so as to fertilize the eggs.
the production or depositing of large quantities of eggs in water.
the reproductive cycle for fish
to deposit eggs in large numbers. Horseshoe crabs spawn on the beaches of the Delaware Bay in May, and shorebirds, which eat the eggs, are provided with food
The release of eggs, fertilized or to be fertilized.