IPA: /əˈfɔːrdəblɪ/
KK: /əˈfɔrdəblē/
In a way that is not too expensive, allowing people to buy or do something without financial difficulty.
The new housing project was designed to be built affordably for low-income families.
Affordably is formed from "afford" (from Old English "forðian", meaning to provide or supply) and the suffix "-ably" (meaning in a manner that is). The word "affordably" means in a manner that provides or supplies something at a reasonable cost.
Think of 'afford' as being able to 'provide' something, and '-ably' means in a way. So, when something is affordable, it means you can provide it without spending too much.