| Word | Definitions | Synonyms |
|---|---|---|
| billionth | (adjective) the ordinal number of one billion in counting order | - |
| millionth | (adjective) the ordinal number of one million in counting order | - |
| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
| quintillionth | (adjective) the ordinal number of one quintillion in counting order | - |
| trillionth | (adjective) the ordinal number of one trillion in counting order | - |