(idiomatic) I haven't heard from you for a long time.

A question that can only be answered by yes or no and does not allow for elaboration or detail.

One who does not change, or opposes a change. / (grammar) A word that does not change its form (for a noun, from singular to plural; for a verb, according to person; etc.).

Used other than figuratively or idiomatically: see no, shit. / (colloquial, vulgar) An exclamation of amazement or disbelief.

Even, furthermore, not to mention. / (literally) Just as, equally, as much/many as, not less, none the less.

(idiomatic) Used to form expressions emphasizing the unsurprising nature of what follows

(dated, euphemistic) Sexually promiscuous.

A show or endeavor cannot proceed without its star or main purpose.

(toxicology) No-observed-adverse-effect level, the highest level of exposure to a substance at which there are no adverse effects on test subjects.

plural of NOAEL