Antonymy is the semantic relationship that exists between two
(or more) words that have opposite meanings. The pairs of words
which have opposite meanings are called antonyms. Antonymous pairs of
words usually belong to the same grammatical category (i.e.,
both elements are nouns, or both are adjectives, or both are verbs, and
so on). They are said to share almost all their semantic
features except one. The semantic feature that they do not
share is present in one member of the pair and absent in
the other.
There are three major types of antonyms:
a. Complementary or contradictory antonyms
They are pairs of words in which one member has a certain
semantic property that the other member does not have (cf. Ly-ons,
1977). Therefore, in the context(s) in which one member is
true, the other member cannot be true.
male/female
married/unmarried
complete/incomplete
alive/dead
present/absent
awake/asleep
b. Relational antonyms
They are pairs of words in which the presence of a certain
semantic property in one member implies the presence of another semantic
property in the other member. In other words, the existence of one of
the terms implies the existence of the other term.
over/under
buy/sell
doctor/patient
teacher/pupil
stop/go
em-ployer/employee
taller/shorter
cheaper/more expensive.
c. Gradable or scalar antonyms
They are pairs of words that are contrasted with re-spect to their
degree of possession of a certain semantic property. Each term
represents or stands for an end-point (or extreme) on a scale
(e.g., of temperature, size, height, beauty, etc.); between those
end-points there are other intermediate points (i.e., there is some
mid-dle ground) (cf. Godby et al., 1982; Lyons, 1977).
hot/cold
big/small
tall/short
good/bad
strong/weak
beautiful/ugly
happy/sad
fast/slow
Antonyms may be:
(a) morphologically unrelated (i.e., one of the elements of the pair does not derive from the other)
good/bad, high/low
(b) morphologically related (i.e., one of the members of a
pair of antonyms is derived from the other member by the
addition of a negative word or an affix)
good/not good
friendly/unfriendly
likely/unlikely.
(http://webdelprofesor.ula.ve/humanidades/azapata/materias/english_4/unit_1_semantic_relationships.pdf)
Lexemes like on and off, old and young, wide and narrow are pairs of antonyms. Antonyms are opposite in meaning, and when they occur as predicates of the same subject the predications are contradictory. Antonyms may be nouns like Communist and non-Communist or verbs such as advance and retreat, but antonymous pairs of adjectives are especially numerous.
English has various pairs of measure adjectives:
long - short
tall - short
high - low
wide - narrow
old - young
deep - shallow
old - new
thick - thin
Lexemes like on and off, old and young, wide and narrow are pairs of antonyms. Antonyms are opposite in meaning, and when they occur as predicates of the same subject the predications are contradictory. Antonyms may be nouns like Communist and non-Communist or verbs such as advance and retreat, but antonymous pairs of adjectives are especially numerous.
English has various pairs of measure adjectives:
long - short
tall - short
high - low
wide - narrow
old - young
deep - shallow
old - new
thick - thin