b) vel, -ve (enclitic) imply a choice between the alternatives; as,—
quī aethēr vel caelum nōminātur, which is called aether or heaven.
2. Correlatives. Disjunctive Conjunctions are often used correlatively; as,—
aut ... aut, either ... or;
vel ... vel, either ... or;
sīve ... sīve, if ... or if.
[343]. Adversative Conjunctions. These denote opposition.
1.
a) sed, but, merely denotes opposition.
b) vērum, but, is stronger than sed, but is less frequently used.
c) autem, but on the other hand, however, marks a transition. It is always post-positive.
DEFINITION. A post-positive word is one that cannot begin a sentence, but is placed after one or more words.
d) at, but, is used especially in disputation, to introduce an opposing argument.
e) atquī means but yet.
f) tamen, yet, usually stands after the emphatic word, but not always.
g) vērō, however, indeed, in truth, is always post-positive.
2. Note the correlative expressions:—