| A | requiring evidence for validation or support |
|---|---|
| A | derived form observed facts |
| A | involving deductive reasoning from a general principle to a necessary effect |
| A | based on hypothesis or theory rather than experiment |
| A | derived by logic, without observed facts |
| A | denoting a quantity consisting of 1,000 items or units |
| A | to a small degree |
| A | (U.S.) one million million |
| A | very large indeterminate number |
| A | a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element (uranium 235 or plutonium 239)) |
| A | the top layer of a soil profile |
| A | in perfect condition or order |