תָּמִיד tâmîyd (H8548)

properly, continuance (as indefinite extension); but used only (attributively as adjective) constant (or adverbially, constantly); ellipt. the regular (daily) sacrifice

1) continuity, perpetuity, to stretch 1a) continually, continuously (as adverb) 1b) continuity (subst)

from an unused root meaning to stretch;