1. Situated in a middle or intermediate position; middle; intermediate.
2. Of a letter, sound, etc.; occurring in the middle of a word.
3. In anatomy and zoology, situated in or relating to the median plane of the body or the midline of an organ; situated towards or nearer to the median plane.
4. A letter and occasionally, a syllable occurring in the middle of a word, not at the beginning or end.

Also, a distinctive written or printed form of a letter used in such a position, e.g. in the Arabic and Syriac scripts.

1. The direction toward, or nearer, the midline.

The medial ligament of the knee is near the inner surface of the leg.

Medial is the opposite of lateral.

2. Etymology: from Late Latin medialis, "of the middle"; from Latin medius, "middle".

Compact, semicircular shaped cartilage (tough elastic tissue) cushions in the inner portions of the junctions formed by the thigh bones and the shin bones: The medial menisci of the knees are located in the inner sides of the knee connecters.

The medial menisci of the knees provide outer curves for conjoining links to move on, serve to evenly load the structures during walking, and aid in disbursing fluids to the joints for lubrication of those skeletal parts.