What's the difference between late and undertime?

Late

Definition:

(v.) Coming after the time when due, or after the usual or proper time; not early; slow; tardy; long delayed; as, a late spring.
(v.) Far advanced toward the end or close; as, a late hour of the day; a late period of life.
(v.) Existing or holding some position not long ago, but not now; lately deceased, departed, or gone out of office; as, the late bishop of London; the late administration.
(v.) Not long past; happening not long ago; recent; as, the late rains; we have received late intelligence.
(v.) Continuing or doing until an advanced hour of the night; as, late revels; a late watcher.
(a.) After the usual or proper time, or the time appointed; after delay; as, he arrived late; -- opposed to early.
(a.) Not long ago; lately.
(a.) Far in the night, day, week, or other particular period; as, to lie abed late; to sit up late at night.

Example Sentences:

(1) It is followed by rapid neurobehavioral deterioration in late infancy or early childhood, a developmental arrest, plateauing, and then either a course of retarded development or continued deterioration.
(2) We have addressed the effect of late intensification with autologous bone marrow transplantation on SCLC through a randomized clinical trial.
(3) The promoters of the adenovirus 2 major late gene, the mouse beta-globin gene, the mouse immunoglobulin VH gene and the LTR of the human T-lymphotropic retrovirus type I were tested for their transcription activities in cell-free extracts of four cell lines; HeLa, CESS (Epstein-Barr virus-transformed human B cell line), MT-1 (HTLV-I-infected human T cell line without viral protein synthesis), and MT-2 (HTLV-I-infected human T cell line producing viral proteins).
(4) A domain containing a CA repeat, similar to ones found in other late, cAMP-induced Dictyostelium genes, is required for cAMP-induced and developmental expression.
(5) This experimental system allows separation of three B lymphocyte developmental stages: early differentiation in vitro, progression to IgM secretion in vivo, and late differentiation dependent upon mature T lymphocytes in vivo.
(6) Thus, successful thrombolysis decreases the frequency of ventricular ectopic activity and late potentials in the early postinfarction phase.
(7) We conclude that the rat somatosympathetic reflex consists of an early excitatory component due to the early activation of RVL-spinal sympathoexcitatory neurons with rapidly conducting axons and a later peak that may arise from the late activation of these same neurons as well as the early activation of RVL vasomotor neurons with more slowly conducting spinal axons.
(8) Blocks of hippocampal tissue containing the fascia dentata were taken from late embryonic and newborn rats and transplanted to the hippocampal region of other newborn and young adult rats.
(9) Psychological well-being and the level of psychological autonomy were studied in a group of 109 Jewish late adolescents in the USSR.
(10) He’s been so consistent this season.” Barkley took the two late penalties because the regular taker, Romelu Lukaku, had been withdrawn at half-time with a back injury that is likely to keep the striker out of Saturday’s trip to Stoke City.
(11) The use of an absorbable material may alleviate potential late complications associated with implantation of nonabsorbable materials.
(12) The fact that IL-3, GM-CSF, and IL-5 regulate basophil function and viability in vitro demonstrates possible mechanisms for the regulation of basophil function and viability in IgE-mediated reactions (especially in late-phase reactions) in vivo by these factors.
(13) The rate of accumulation was highest late in infection and only the slower migrating form incorporates significant amounts of glucosamine.
(14) Results obtained from cumulative labeling and pulse-labeling and chase experiments with cells from late gastrulae, yolk plug-stage embryos, and neurulae showed that the 30S RNA is an intermediate in rRNA processing and is derived from 40S pre-rRNA and processed to 28S rRNA.
(15) In late May, more than 50 residents of Ust-Usa protested the effects of oil drilling and plans for a new oil well near the village.
(16) After early repair of congenital cardiovascular defects, such as coarctation of the aorta, late stenosis may become a problem.
(17) The Very Late Antigens (VLAs) are alpha beta heterodimeric transmembrane proteins mediating cell-substratum as well as cell-cell interactions.
(18) To determine if late viral genes contribute to target cell lysis, phosphonoacetic acid (PAA), an inhibitor of DNA polymerase activity, was used to block DNA replication that is required for expression of late viral proteins.
(19) Five late strokes were ipsilateral (1.8%) and six were contralateral (2.1%) to the operated carotid artery.
(20) Unrecognized flexion injuries of the cervical spine may lead to late instability and neurologic damage.