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| Sr. | Term | Definition |
| 1 | Offset | A horizontal distance measured at right angles to a survey line to locate a point off an edge line. |
| 2 | Optimum Moisture Content | That moisture content of a soil at which a precise amount of compaction produces the highest dry density. It is particularly important to achieve this in soil stabilization before the road is completed. It is the percentage of moisture at which the greatest density of a particular soil can be obtained through compaction by a specified method. |
| 3 | Overburden | Material of inferior quality which overlies material of desired quality and which must be removed to obtain the desired material quality. |
| 4 | Overlay | One or more courses of asphaltic concrete layers placed over existing worn or cracked pavement. |
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