1. to make soil or land more fertile by adding nutrients or fertilizer
Usage: British spelling; American English uses 'fertilizes'; commonly used in agriculture and gardening
2. to cause an egg or plant to develop by introducing male reproductive cells
Usage: biological/reproductive context; British spelling; American English uses 'fertilizes'

Examples

• The farmer fertilises the fields every spring to improve crop yield.
• Adding compost fertilises the garden soil naturally.
• The pollen fertilises the flower, allowing it to produce seeds.
• Modern agriculture relies on chemicals that fertilise crops quickly.
• She fertilises her houseplants monthly during the growing season.
• Nitrogen-rich fertiliser fertilises the lawn and promotes green growth.