constitutional

Vladimir Nabokovの "Lolita" の Part 2, Chapter 35から引用します。

So I trudged upstairs. My right hand clutched muffled Chum in my pocket, my left patted the sticky banisters. Of the three bedrooms I inspected, one had obviously been slept in that night. There was a library full of flowers. There was a rather bare room with ample and deep mirrors and a polar bear skin on the slippery floor. There were still other rooms. A happy though struck me. If and when master returned from his constitutional in the woods, or emerged from some secret lair, it might be wise for an unsteady gunman with a long job before him to prevent his playmate from locking himself up in a room.

"constitutional" のここでの意味(a regular walk taken as a form of exercise)は１５年前（6/22/2008）に知りましたが、何故この様な意味があるのか調べるために "constitution" を辞書で見ると：

・Oxford English Dictionary: the condition of a person’s body and how healthy it is: to have a healthy/strong/weak constitution
・Vocabulary.com: A constitution is a statement of the basic principles and laws of a nation, state, or group, such as the U.S. Constitution. Another very common meaning of constitution is the physical makeup of a person.
The noun constitution is from Latin, from constitutus, "set up, established," plus the suffix -ion, meaning "act, state, or condition." So think of a constitution as how a body (yours, the government's) is set up. If you have a strong constitution, it means you don't get sick very often.

なるほど、"constitution" は元々国の事だけではなく人間も対象なのですね。