required; needed; necessary
seasoning; flavoring; flavouring; addition; inclusion; taking into account
condition; assumption; intention; intent; premise (in logic)
numeral; figure; digit; numeric character
flight time; number of flight hours
moderate; reserved; conservative; humble; mild-mannered; self-effacing
knowing; (an) acquaintance
timewise; temporal; chronal
postponement; deferment; extension (of time)
search (esp. for someone or something missing); manhunt; legally authorized search of a person, building, etc.
death; mortality; to die; to pass away
in preparation (for); in case (of); in the lead-up (to)
going side-by-side; going abreast; running concurrently; occurring at the same time; keeping pace with
consultation; discussion; discussing; asking (somebody) for advice
to offer (a suggestion, etc.); to propose (an idea, etc.); to approach with (a proposal, etc.)
front and rear; front and back; before and after; around; about; order; context
existence; being; survival; to exist; to live; to survive
third day of the month; three days
to make absolutely sure; to make doubly sure
journey; trip; travels; during the journey; on the way; while travelling
to stop by; to drop in for a short visit
correspondence; communication; transmission; news; signal; telecommunications
birth; lineage; identity; background; provenance; origin
to open (e.g. doors); to open (e.g. business, etc.); to be empty; to be vacant; to be available; to be open (e.g. neckline, etc.); to have been opened (of one's eyes, mouth, etc.)
to lead; to take the lead (in doing something); to precede; to go before; to die before (esp. one's spouse, parents, etc.); to be a prerequisite
receiving (a message, letter, email, etc.); reception (radio, TV, etc.)
anyone; anybody; everyone; everybody; whoever
interception; monitoring; tapping
nature (of a person); sex; gender; sex (i.e. sexual attraction, activity, etc.); gender; -ty
giving and taking; exchange (of letters); arguing back and forth; (conversational) exchange
to turn toward; to look (up, down, etc.); to face (e.g. east) (of a building, window, etc.); to look out on; to point (of an arrow, compass needle, etc.); to be suited to
ease of use; user-friendliness; usability; utility; convenience
in range; within the limits (of...); within (a) range
always; without exception; necessarily; certainly; without fail; positively
contact network; phone tree; contact information for relevant people (in a given organization)
transmission (e.g. news, chemical signals, electricity); communication; delivery; conveyance; transfer; relay
dispatch; despatch; transmission; informing (e.g. of opinion); sharing (thoughts, etc.); telling
to take measures (against); to take steps