The phrase "alteration or addition" is correct and usable in written English.
It can be used in contexts where changes or enhancements to something are being discussed, such as in legal documents, contracts, or project specifications.
Example: "Any alteration or addition to the original agreement must be documented and signed by both parties."
Alternatives: "modification or enhancement" or "change or supplement".
The alteration or addition to the model is that PCP alters actin polymerization locally.
Any alteration or addition was likely to raise howls of objection.
(ii) The alteration or addition could significantly change the nature or increase the quantity of pollutants discharged.
Diller and her partners are taking on the Hirshhorn Museum in Washington DC, a hovering, forbidding, concrete doughnut whose form and material could not be more hostile to alteration or addition.
Limiting the comparison to regular training rather than non-exercise interventions allowed a pragmatic analysis of the efficacy of exercise used as an alteration or addition to regular training.
The permittee shall give notice to the Director as soon as possible of any planned physical alterations or additions to the permitted facility.
"Whenever I've made alterations or additions, it's been led by a desire to maximise use of the space but visually, I've always tried to get the balance right between being sympathetic to period features and what I consider to be timeless, functional, beautiful design".
With the exception of various modernizations, including the installation of central heating, electricity, and elevators, no significant architectural alterations or additions were made until 1959 60, when the east front was extended 32.5 feet (10 metres) under the supervision of J. George Stewart.
By law the owners were not allowed to make any structural alterations or additions, so while this must have been a nightmare for the architects, it has resulted in the hotel retaining the structural integrity and not inconsiderable charm of the old village.
Financial institutions may make alterations, substitutions, or additions in the clauses to reflect the services offered, such as technical changes (including the substitution of a trade name for the word "card," deletion of inapplicable services, or substitution of lesser liability limits).
