| Fixed connection: | (english) In two dimensions, a fixed connection between two members restrains all three degrees of freedom of the connected member with respect to one another. A fixed connection is sometimes called a rigid connection or moment-resisting connection. |
| Fixed support: | (english) In two dimensions, a fixed support restrains three degrees of freedom: two translations and one rotation. |
| Chemical fixation (or stabilization/solidification) | (Environmental Engineering) A term for several different methods of chemically immobilizing hazardous materials into a cement, plastic, or other matrix. |
| Fixed solids | (Environmental Engineering) (FS) are the solids that do not volatilize at 550°C. |
| Fixed suspended solids | (Environmental Engineering) (FSS) is the matter remaining from the suspended solids analysis which will not burn at 550°C. It represents the non-filterable inorganic residue in a sample. |
| Nitrogen fixation | (Environmental Engineering) The conversion of atmospheric (or dissolved) nitrogen gas into nitrate by microorganisms. |
| Corrective maintenance - | (Software Engineering) finding and fixing defects that have been reported by users |
| antefix | ลวดลายตรงชายคา (eaves) ในปัจจุบัน หรือ cornice ในสถาปัตยกรรมในสมัยคลาสสิค เพื่อปิดซ่อนปลายสุดของแผ่นกระเบื้อง |
| crucifix | ไม้กางเขน |
| fixd-focus lens | แว่นหรือเลนส์ ที่มีระยะวัด หรือเห็นชัดได้คงที่ ไม่ว่าภาพนั้นจะอยู่ในระยะเท่าใด |