2. Any of the folds on the surface of the brain.

3. The shape of something rotating; a vortex.

4. State or condition of being convoluted.

5. A form of moving average.

6. A function which maps a tuple of sequences into a sequence of tuples.

7. One 360° turn in a spring or similar helix. A keyring contains 2 convolutions.

1. The high-pitched sound of a small object moving rapidly through air.

2. Energy; vigor; vim.

3. A zip fastener.

4. Zero; nothing.

5. A trip on a zipline.

6. A zip file.

7. An ounce of marijuana.

1. To close with a zip fastener.

2. To close as if with a zip fastener.

3. To compress (one or more computer files) into a single and often smaller file, especially one in the ZIP format.

4. To subject to the convolution mapping function.

5. (followed by a preposition) To move rapidly (in a specified direction or to a specified place) with a high-pitched sound.

6. (followed by a preposition) To move in haste (in a specified direction or to a specified place).

7. To make (something) move quickly

8. To travel on a zipline.

1. Zero; nothing.

1. Imitative of high-pitched sound of a small object moving rapidly through air.

2. (by extension) Any postal code, for any country.