If person is a qualifier, they've done well enough at some sport or activity to make it into an important competition. Qualifiers have made it into the big league.

When a word, rather than a person or a team, is described as a qualifier, it means that it modifies another word. Grammatical qualifiers are often adjectives. In the sentence "That is a fluffy cat," the word fluffy is a qualifier, attributing a specific quality to the word cat. The root of qualifier is the Latin qualis, "Of what sort?"

Definitions of qualifier
  1. noun
    a contestant who meets certain requirements and so qualifies to take part in the next stage of competition
    “the tournament was won by a late qualifier
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    type of:
    a person who participates in competitions
  2. noun
    a content word that qualifies the meaning of a noun or verb
    synonyms: modifier
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    intensifier, intensive
    a modifier that has little meaning except to intensify the meaning it modifies
    a word that expresses an attribute of something
    a word that modifies something other than a noun
    dangling modifier, misplaced modifier
    a word or phrase apparently modifying an unintended word because of its placement in a sentence: e.g., `when young' in `when young, circuses appeal to all of us'
    descriptive adjective, qualifying adjective
    an adjective that ascribes to its noun the value of an attribute of that noun (e.g., `a nervous person' or `a musical speaking voice')
    classifying adjective, relational adjective
    an adjective that classifies its noun (e.g., `a nervous disease' or `a musical instrument')
    positive, positive degree
    the primary form of an adjective or adverb; denotes a quality without qualification, comparison, or relation to increase or diminution
    comparative, comparative degree
    the comparative form of an adjective or adverb
    superlative, superlative degree
    the superlative form of an adjective or adverb
    dangling participle
    a participle (usually at the beginning of a sentence) apparently modifying a word other than the word intended: e.g., `flying across the country' in `flying across the country the Rockies came into view'
    a word or group of words function as an adverb
    type of:
    content word, open-class word
    a word to which an independent meaning can be assigned
Word Family