| early(adjective, characteristic, start, beginning, introduction) |
| elementary(adjective, characteristic, start, beginning, introduction) |
| empirical(adjective, characteristic, trial, experiment) |
| experiential(adjective, characteristic, trial, experiment) |
| experimental(adjective, characteristic, trial, experiment) |
| exploratory(adjective, characteristic, trial, experiment) |
| inaugural(adjective, characteristic, start, beginning, introduction) |
| incipient(adjective, characteristic, start, beginning, introduction) |
| inductive(adjective, characteristic, start, beginning, introduction) |
| initial(adjective, characteristic, start, beginning, introduction) |
| initiatory(adjective, characteristic, start, beginning, introduction) |
| introductory(adjective, characteristic, start, beginning, introduction) |
| laboratory(adjective, characteristic, trial, experiment) |
| momentary(adjective, characteristic, trial, experiment) |
| opening(adjective, characteristic, start, beginning, introduction) |
| original(adjective, characteristic, start, beginning, introduction) |
| pilot(adjective, characteristic, trial, experiment) |
| precursory(adjective, characteristic, start, beginning, introduction) |
| prefatory(adjective, characteristic, start, beginning, introduction) |
| prelusive(adjective, characteristic, start, beginning, introduction) |