In retrospect, Shane should have filled his car up with gas at the last service station instead of thinking he had enough to get to the next town.
An example of a retrospect is when you look back on a decision you made and, knowing the outcome, realize you should have made a different choice.
Origin of retrospectfrom Classical Latin retrospectus, past participle of retrospicere, to look back from retro-, back + specere, to look: see spy
verbret·ro·spect·ed, ret·ro·spect·ing, ret·ro·spects
Origin of retrospectFrom Latin retrōspectus past participle of retrōspicere to look back at retrō- retro- specere to look at ; see spek- in Indo-European roots.
- consideration of past times
(third-person singular simple present retrospects, present participle retrospecting, simple past and past participle retrospected)
- To look or refer back to; to reflect on
Latin retrÅspectum, from retrÅspicio (“to look back at").