Definition

Something that does not allow air to pass through it, or is very strong and has no weaknesses or flaws.

Example

The container is designed to be airtight, ensuring that no air can enter or escape.

Conversation

Did you hear about the new storage containers they sell?

Yeah, I heard they're supposed to be airtight and really durable.

Exactly! I need something airtight to keep my food fresh longer.

That's a smart idea. Fresh food makes such a difference!

Synonyms & Antonyms

Root Explanation

Airtight → It is formed from "air" (from Old English "aer", meaning the invisible gaseous substance surrounding the earth) and "tight" (from Old English "tiht", meaning firmly held or secure). The word "airtight" describes something that is secure against the passage of air.

Memory Tip

Think of something that is completely secure against air — 'air' refers to the gaseous substance, and 'tight' means firmly held. This helps you remember that 'airtight' means no air can pass through.

Visually Confused Words