1. hälving (kõrvalekalle), millest tingituna toode ei vasta standardis toodule või selle olemasolu osutub materjalile tootele ekspluatatsioonis ebasoovitavaks; 2. kristallilise ehituse kõrvalekalle erinevate elementide aatomite paigutumisest kristallivõres (vrd mittepidevus), 1. an imperfection or discontinuity in product that interferes with usefulness or the aestetic value of the product; 2. crystal lattice imperfection which may be due to the introduction of a minute proportion of a different element into lattice; 3. a discontinuity or discontinuities that by nature or accumulated effect render a part or product unable to meet minimum applicable acceptance standards or specifications (compare: discontinuity)