| has derived form | eng: first-order approximation |
| has derived form | eng: first-order control |
| has derived form | eng: first-order difference |
| has derived form | eng: first-order election |
| has derived form | eng: first-order fluid |
| has derived form | eng: first-order function |
| has derived form | eng: first-order hold |
| has derived form | eng: first-order levelling |
| has derived form | eng: first-order logic |
| has derived form | eng: first-order ordinary differential |
| has derived form | eng: first-order predicate |
| has derived form | eng: first-order reaction |
| has derived form | eng: first-order relief |
| has derived form | eng: first-order spectrum |
| has derived form | eng: first-order station |
| has derived form | eng: first-order subroutine |
| has derived form | eng: first-order theory |
| has derived form | eng: first-order transition |
| has derived form | eng: first-order variable |
| lexical category | adjective |
| semantically related | eng: addiction |
| semantically related | eng: dependent area |
| semantically related | eng: dependent territory |
| semantically related | eng: disavowal |
| semantically related | eng: sib |
| translation | eng: relationship |
| translation | nld: eersteorde- |