2. Biosphere, stratosphere, sky: The rocket blasted off into the air.
3. Wind, breeze, draft, current: When Andrea Gill opened the window, cold air blew in through the open window.
This is an old-fashioned or a literary term.
2. To deviate from an established moral code; to transgress, sin, misbehave: To err is human, to forgive divine.
2. A person who succeeds or is in line to succeed to a hereditary rank, title, or office: The king did not have an heir when he died.
An heir is someone who may be worth more financially than others and still be worthless.
Angie, the heir to the science project started to err when she wrote that ere there was air, the earth was surrounded by carbon dioxide.
2. A person who inherits some title or office; a successor: "The CEO’s daughter became the new CEO in her father’s company.
3. A person who inherits or is entitled by law or by the terms of a will to inherit the estate of another.
4. A person who succeeds or is in line to succeed to a hereditary rank, title, or office.
5. Anyone who receives or is expected to receive a heritage, as of ideas, from a predecessor.
2. A person who is very likely to have a job or position after the one who has it now leaves: "The owner of the company named his son as heir apparent of the business."