Fertilize (verb)

1. To make (land or soil) fertile by adding nutrients, especially by applying manure or a fertilizer.
2. To cause (an egg or ovum) to unite with spermatozoon in order to form a zygote.
3. To provide the necessary conditions for growth or development.

Origin:

Early 17th century: from medieval latin fertilizare, from latin fertilis fertile.

Examples:

1. I need to fertilize the lawn.
2. The egg was fertilized by the sperm.
3. The farmer is going to fertilize the fields.
4. The plants need to be fertilized regularly.
5. The process of fertilizing an egg is called insemination.