uni-, un-

1. A reference to cells that are capable of developing into only one type of cell or tissue.
2. Referring to those cells that produce a single type of daughter cell; e.g., a unipotent stem cell.

Arranged in or consisting of a single row or series.

Arranged in one row, as the seeds of a pea or string bean.

1. One of the individuals or groups that together constitute a whole; one of the parts or elements into which a whole may be divided or analyzed.
2. A group regarded as a distinct entity within a larger group.
3. A mechanical part or module, or an entire apparatus or the equipment that performs a specific function.
4. One of a number of things, organizations, etc., identical or equivalent in function or form.
5. Any specified amount of a quantity, as with reference to length, volume, force, momentum, or time, by comparison with which any other quantity of the same kind is measured or estimated.
6. In medicine, the quantity of a vaccine, serum, drug, or other agent necessary to produce a specific effect.
7. A fixed amount of scholastic study used as a basis for calculating academic credits, usually measured in hours of classroom instruction or laboratory work.
8. A section of an academic course focusing on a selected theme; such as, a unit on U.S History.
9. The number immediately to the left of the decimal point in the Arabic numeral system.
10. In mathematics, the lowest positive whole number; one.
11. Etymology: from 1570, "a single number regarded as an undivided whole", alteration of unity on the basis of a digit. Meaning "single thing regarded as a member of a group" is attested from 1642.