meta- Definition

meta-
met-
combining form

1. Denoting a change.

Example: metabolism
2. An area of study related to another subject of study, but going beyond it in some way.

Example: metalinguistics
3. A position behind or beyond something.

Example: metacarpal
4a. chem.
A derivative of, or an isomer or polymer of, a specified substance;
Example: metaldehyde
4b. chem.
An acid or hydroxide derived from the ortho- (sense 4b) form of a specified substance by loss of water molecules;
4c. chem.
A benzene substitution product in which the substituted atoms or groups are attached to two carbon atoms which are themselves separated by one carbon atom.

Etymology: From Greek meta among, with, beside or after.