• Chambers's Twentieth Century Dictionary
    • Y-level an engineers' spirit-level, so called because of the telescope formerly resting on 'Y's,' capable of being rotated at will—now substituted by the 'dumpy-level'
    • Y-level . See Y.
    • ***


In literature:

All y' got t' do is t' treat me on th' level.
"The Voice in the Fog" by Harold MacGrath
Describe a Y level, and name its adjustments.
"Scientific American Supplement, No. 561, October 2, 1886" by Various

In poetry:

W'y, I 's done de double shuffle, twell a body could n't res',
Jes' a-hyeahin' Sam de fiddlah play dat chune his level bes';
I could cut a mighty caper, I could gin a mighty fling
Jes' right now, I 's mo' dan suttain I could cut de pigeon wing.
"Temptation" by Paul Laurence Dunbar

In news:

Y'know, it's already harder and harder to get excited about each new NFL season as more information steadily comes out about how inherently dangerous the sport, notably at the professional level, is to the human brain.
Legislators in Westchester County, N.Y. Voted Monday to require local outlets of chains with at least 15 units nationwide to post calorie counts on their menus and menu boards, a move targeted at reducing obesity levels.
Child dies as blast levels house in N.Y.

In science:

The directed lines are the level lines separating adjacent terraces with height diffrence 1 in Fig. 2, projected onto the (x, y) plane and shifted by (x, y) → (x + h(x, y), y) to avoid partial overlap.
Random Matrices, the Ulam Problem, Directed Polymers & Growth Models, and Sequence Matching
Let H (z , y) be the collection of all paths from z to y on level 0 that contain y only as the last site, and analogously for H (0, y).
Quenched invariance principle for multidimensional ballistic random walk in a random environment with a forbidden direction
Furthermore, the automorphisms which keep fixed a chosen consistent orientation of the level curves of the indefinite germ form a subgroup Z2 ⊕ Z2 , which is generated by ((x, y) 7→ (y , x), − id R ) and ((x, y) 7→ (−y , −x), − id R ) .
Fold maps and immersions from the viewpoint of cobordism
KH∗(Y ; R) is better behaved at the chain level.
Kuranishi homology and Kuranishi cohomology
However, at the chain level we need to allow k < 0, k (Y ; R) can be nonzero for any k ∈ Z.
Kuranishi homology and Kuranishi cohomology