The phrase "an almost equivalent" is correct and usable in written English.
It can be used when discussing something that is similar or comparable to another thing, but not exactly the same.
Example: "The two products serve an almost equivalent purpose, though one is more efficient than the other."
Alternatives: "a nearly equivalent" or "a close equivalent".
Pumped storage plants, principally the fabulous Dinorwig plant in north Wales, present an almost equivalent absurdity.
Scientists have been hard put to explain how the two species differ so much in body and behavior when they seem to have an almost equivalent set of genes.
Paul Cheshire, professor emeritus of economic geography at LSE and a researcher at the Spatial Economics Research Centre, has produced data showing that restrictive planning laws have turned houses in the south-east into valuable assets in an almost equivalent way to artworks.
The RW method was influenced by the perfusion defects in the diffuse heterogeneity classification in an almost equivalent manner to the physicians' ranking.
Conversely, in loose contact conditions, the morphology plays a more relevant role: the nanofibers, despite the almost null SSA, exhibit an almost equivalent activity to that of the SCS powders.
Comparison with a commercial SS formulation (Cyclocap®) showed that the SFD preparation had an almost equivalent FPF6.4μm when analysed with a twin-stage impinger (TSI; 24.0 ± 1.2% and 26.4 ± 2.2%, respectively) and good performance when analysed with NGI (FPF4.46μm:16.5 ± 2.0 and 27.7 ± 1.7, respectively).
Scatchard analysis revealed low-affinity/high-binding capacity against human insulin for high-affinity sites of IA (Fig. 1 A ), almost equivalent to values reported in typical IAS cases (3), indicating IAS-like pathophysiological features.
As the median target magnitude was M 7.0, we selected a region radius of 20 km, with an area almost equivalent to the focal size of an M 7.0 earthquake (Utsu and Seki, 1955).
By 2015, that number is expected to reach a hundred million, a number almost equivalent to India's today.
It is usually estimated that more than 800,000 Rwandans, mostly Tutsis, were murdered in the following three months – a number almost equivalent to the entire British and colonial military death toll for the whole of the first world war.
The Leu80 in the distal heme pocket of CYP175A1 was located at a position almost equivalent to the Glu183 that is involved in stabilization of the ferryl heme intermediate in chloroperoxidase (CPO).
