Would you confirm that the article is semantically valid in differentiating the expressions below which have only TWO meanings in common:
on a level
on the level
on a level - 1. of the same hight: She'd only brogue heels on her feet; and her shoulders were just about on a level with his.
2. of the same rank or quality: He has 'come back' with such certainty that he must of necessity be regarded as on a level with all the other big men.
on the level - 1. in a position where the ground is level: I should like a house on the level; I find it very tiring to climb this hill.
2. = on a level 1: His uniform was always spotless and he wore his white hat, no baseball caps then, down on the level with his eyebrows.
3. = on a level 2: It is hard to imagine that West would have minded this tribute, which put him on the level with Hogarth and Rembrandt.
4. (coll.) honest; trustworthy: Fred is on the level. He'll do a proper job for you and charge you a reasonable price.
P.S. Please e-mail me the answer, if possibl