| Answer | Crossword Clue |
|---|---|
| GRADINE | One of a series of steps |
| STAIR | One of a set of steps |
| STAIR | One in a set of steps |
| GOROUND | One of a series of attempts |
| TIER | One of a series of rows |
| TIER | One of a series of rows. |
| GOROUND | One of a series of recurring actions |
| PSALM | One of a disconnected series of biblical poems |
| YARD | One of 10 in a series of football downs |
| ZIG | One of a series of sharp turns or angles. |
| BION | One of a series of joint Soviet-U.S. space satellites |
