Englishfor English speakers
accessibility
Noun
—
Accessibility is the property of being accessible.
The accessibility of the city depends on how well it is linked by roads.
envelope
Noun
—
An envelope is a paper cover that you put a letter in to send it.
She put the letter into the envelope, addressed it to Charles, and put a stamp on it.
—
An envelope is a covering that goes all the way around something.
Each virus has a special envelope of protein surrounding it.