[ley-tist] 
| 1. | most recent; current: latest fashions. |
| 2. | last. |
| 3. | the latest, the most recent news, development, disclosure, etc.: This is the latest in personal computers. |
| 4. | at the latest, not any later than (a specified time): Be at the airport by 7 o'clock at the latest. |
| lat·est (lā'tĭst) adj. Superlative of late. n. Something that is the most recent or current of its kind: the latest in electronic gadgetry. |
at the latest
No later than. For example, We have to be in New York by Monday at the latest. This idiom was first recorded in 1884.
tɪst