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Are there two single words to differentiate the two parts of a round trip?

If a single word does not exists, what is the shortest yet currently used locution?

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possible duplicate of Is there a word for "part of a route"? – Robusto Aug 26 '11 at 18:19
Also, please don't thank us in the question; I will ruthlessly delete any Thankses at the end! – Daniel Aug 26 '11 at 18:29
There and Back Again :) – aedia λ Aug 26 '11 at 18:52
@Robusto I thought it was a duplicate at first, and then realized many possible answers are not part of that other question! – F'x Aug 26 '11 at 18:55
@Robusto (or moderator): If this question ends up being closed as duplicate, can the answers below be migrated to the duplicate? – Mitch Aug 26 '11 at 21:18
up vote 11 down vote accepted

If you need to differentiate, they would be the outward leg and the return leg.

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outbound |ˈaʊtˈˌbaʊnd| (adjective & adverb)
traveling away from a particular place, esp. on the first leg of a round trip: an outbound flight, flying outbound.

inbound |ˈɪnˈˌbaʊnd| (adjective & adverb)
traveling toward a particular place, esp. when returning to the original point of departure: inbound traffic, we have three enemy planes inbound on bearing two ninety.

Return is also adequate for the latter, as indicated by JeffSahol.

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+1 I like the symmetry in these. I prefer them to outward and return. – BenjaminGolder Jun 14 '13 at 20:18

Parts of trips are legs, but that can also mean a trip where you had a layover (two legs in the same direction).

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There are lots of additional options of interest here...

Though people do use the word legs, I think the more common thing in practice is actually going there and coming back as adverbial phrases (e.g., "Coming back, we fly Delta"); or you can simply talk about the outbound trip or outbound portion of the trip and the return portion of the trip ("The return portion of the trip is 6 hours long".)

You can even say "My/The return flight is 6 hours long." Since a return trip requires multiple flights, this is unlikely to cause ambiguity.

Finally, somebody mentioned the potential ambiguity of legs. Some of this ambiguity can be resolved by using segments instead (legs being made up of segments). This is a word that the airline folks tend to use a lot.

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