barrierless

adj — 2 senses

barrierless

adj

Etymology From barrier + -less.

1

Lacking barriers

The world is increasingly barrierless.
High Mill crossing, at present gated and manually-operated, will become a barrierless rural-type crossing.1979 August, Michael Harris, “A line for all reasons: the North Yorkshire Moors Railway”, in Railway World, page 412:

1 more example

In Burneside in the Lake District on July 29, an incident took place at a barrierless level crossing on the Windermere branch that has been described by senior railway staff as one of the closest near misses they've ever seen.2021 August 25, “Network News: New warnings to the public after trespass and near-miss incidents”, in RAIL, number 938, page 13:

2

Chemistry, Natural sciences, Physical sciences Physical Not requiring activation energy.

The reaction is then barrierless, ie, ΔG* = 0, and the rate constant is a maximum for the given λ (Figure 6).1992, R.A. Marcus, Prabha Siddarth, “Theory of Electron Transfer Reactions and Comparison with Experiments”, in Elise Kochanski, editor, Photoprocesses in Transition Metal Complexes, Biosystems, and Other Molecules, page 63:

Derived terms: barrierlessly, barrierlessness

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.