the/a right person and the tallest person

Why is it 'tallest person' always only takes 'the,' and that 'right person' may sometimes take 'a' depending on what you mean?

I don't know how I should put it, but the 'comparative superlative + noun' and 'right + noun' are said to require the definite article 'the.' However, while the former always calls for 'the,' the latter sometimes licenses the use of 'a/an' when there are a lot of 'right' people etc. although, granted, most of the time 'the' is attached. What do you think makes the difference?

• He is the tallest person in the class. [Nobody is the same height or higher]
• He is one of the tallest people in the class.
• He is a tallest person in the class. [NOT IDIOMATIC]

• He is the right person to ask the question.

• He is a right person to ask the question. [There are many other right people who could answer it]

EDITED: superlative >>> comparative superlative + noun

• There can be many people who are "right", but only one who is "tallest". Commented Mar 4, 2020 at 2:15
• The adj 'tallest' is superlative, which in general have a definite article before it, like the best, the worst, the most sought-after, etc. Commented Mar 4, 2020 at 2:16
• @Hot Licks You may have two 183-cm boys in your class ... Commented Mar 4, 2020 at 2:39
• @Ram Pillai Yes, syntactically it IS observed, but you may have two boys exactly the same height. And you can't say 'a tallest person' while you can 'a right person.' Commented Mar 4, 2020 at 2:43
• Then, "He is one of the best persons..." could be considered. 2) //He is a right person to ask the question.// sounds a little odd too. It can be reworked as "He is one of the right persons..." The word 'right' goes like right, more right, most right. Commented Mar 4, 2020 at 5:57

Before you ask the 'why' question, I think you should set the facts straight first.

...the superlative always calls for 'the'...

That's not true, because both these superatives all sound fine without the definite article:

(1) He is tallest in the class.

(2) Last week, no less than 76 per cent of the public said that the spread of the virus was the story to which they had paid most attention. (The Times)

(3) The Korean thriller “Parasite” has become the first non-English language film to win the Oscar for best picture. (New York Times)

Therefore, it's not the superlative itself that requires 'the'.

What requires 'the' is the 'superlative + noun' combo where the presence of the superlative makes the noun phrase definite in context.

• I should have said 'the comparative superlative capping a noun,' JK2. You're right you would say, "He is (the) tallest in the class." And your second is an example of 'the absolute superlative," telling your listener "She is a very beautiful girl." Commented Mar 4, 2020 at 5:48
• Question edited. Commented Mar 4, 2020 at 5:55
• @Sssamy I don't think 'comparative superlative' is a generally accepted term among grammarians and linguists, so I don't know what you mean by that term.
– JK2
Commented Mar 4, 2020 at 6:09
– JK2
Commented Mar 4, 2020 at 6:45
• I should have used a commoner term for that, which us semanticists use --- relative superlative. Or, we add 'reading' --- comparative/relative reading of the superlative. Commented Mar 4, 2020 at 7:56

Typically the superlative expressed with most or –est requires a definite article because the semantics of the superlative requires a unique element. So in a context where there are two equally tall people in the room, it's infelicitous to say (1)

1. Arthur is the tallest person in the room.

This is typically true of how the definite article works in English independent of the superlative. The definite article usually picks out a unique individual in the context. For example, the following is also an infelicitous use of the definite. (The # symbol is used to mean "inappropriate for the context".)

1. Arthur and Bob came into the room. #The man sat down.

So the use of the definite in the superlative follows from the fact that there is a unique individual who satisfies the description.

It's not true, however, that the superlative requires a definite article. For example, suppose we are inquiring about the heights of the players on a basketball team. It's perfectly reasonable to say (3):

1. Does this team have a tallest player?

Here, uniqueness is what's being questioned, and so the indefinite article is used, and the definite is impossible. Similarly, if we were evaluating all the teams in a league, we could felicitously say something like 4.

1. Every team except two has a tallest player.

In these cases the uniqueness requirement of the superlative is being evaluated relative to each team, so these noun phrases could be paraphrased as "a player who is the tallest one on that team".

The preference of the definite article with adjectives like right and wrong is again due to the fact that there is a presupposition that there is a unique right or wrong answer in the context, but this isn't really built into the meaning of these adjectives. Any time this expectation is not met, the indefinite article will be able to be used:

1. For this question both Sara and Lisa gave a right/wrong answer.

"Tallest" is related to a comparison word and is unique to a particular person, and each comparison words should be put with "the" in front.

Additionally, you can change "he is a right person to ask the question" by putting the superlative words in front to become :

"He is the best right person to ask the question."

Still, we are putting the word "the".

• "the best right person" sounds odd.
– JK2
Commented Mar 4, 2020 at 3:59
• @Amzar. I'm looking at where there are more than just one person who is tallest. In the same situation, you would say 'a right person,' but with 'tallest' you can't say 'a tallest person.' Commented Mar 4, 2020 at 5:58
• Ooops, there 'is' more than just one person. Commented Mar 5, 2020 at 1:31
• There is no "the best right person" or "he is a right person". Commented Mar 29, 2021 at 19:12

I dispute the assumption of the question that “a right person” is acceptable usage in educated circles. I would always say:

the right person”

with the implication that there is a single person (within the particular context); or one is referring to a specific person:

John is the right person to go to for help.”

Whereas if I were recommending that someone in general should be sought to solve the problem, I would write:

“You should look for a suitable person to help.”

I would say that this conforms more or less to the normal usage of the definite and indefinite articles in educated speech.

• "the right person" is definitely more usual. You can have a right answer and other things so it's hard to specify the boundaries. Commented Dec 24, 2021 at 23:52