Select the most appropriate one-word substitution for the given group of words.

A Constant effort for achieving something

Perseverance

The most appropriate one-word substitution for "a constant effort for achieving something" is perseverance.

• Severance is the act of cutting off or ending something.
• Servitude is the state of being a servant.
• Belligerent is aggressive or warlike.

The word perseverance comes from the Latin word "perseverare," meaning "to continue steadily." Perseverance is the ability to keep trying even when things are difficult. It is a key quality for achieving success in anything.