The phrase "a key commitment" is correct and usable in written English.
You can use it to emphasize an important promise or obligation in various contexts, such as business, personal relationships, or social responsibilities.
Example: "Our organization has made a key commitment to sustainability and reducing our carbon footprint."
Alternatives: "a crucial promise" or "an essential obligation."
"This will deliver a key commitment we made in our manifesto".
"Opening up access to research findings is a key commitment for this government.
The extension of the right-to-buy scheme to housing association tenants was a key commitment in the Conservative's election manifesto.
"David Axelrod thinks it is important that we continue to voice our support for this proposal which was a key commitment you made before coming into office," they wrote.
This was a key commitment because negotiated tariff reductions would be meaningless if countries could simply use taxes or subsidies to discriminate in favor of local products once imports entered the market.
Despite the support of the local MP, Surrey needs more volunteers – a minimum of 20 in each of its six clinical commissioning areas – to help realise its plans to become a dementia-friendly community, a key commitment of the prime minister's challenge on dementia.
Some aid agencies fear this will result in a watering down of the key commitment to helping people out of poverty, contained in the Millennium Development Goals (MDGs).
For them a green investment bank was always the key commitment on which the coalition government's credibility and progress would ultimately be judged.
After the Lords vote was announced, Mr Cameron tweeted: "A key manifesto commitment delivered as the EU Referendum Bill clears Parliament.
Biodiversity management has been a key environmental commitment for over a decade and is part of Anglian Water's love every drop sustainability strategy.
The government is to break a key manifesto commitment to introduce new rules next spring designed to prevent older people from having to sell their homes when they go into care.
