Extremely small in scale or scope or capability.
Prefix (symbol m) denoting a one-millionth part. For example, a micrometer (mm), or micron, is one-millionth of a meter.
1. In nonexact measurements, small or compact, as in microprocessor or microcomputer.
2. Metric prefix meaning 10^(–6) (one millionth).

1. Microcomputer
2. Microprocessor